A swimming pool, swimming bath, wading pool, or simply a pool, is an artificially enclosed body of water intended for swimming or water-based recreation. Water is a common Chemical substance that is essential for the survival of all known forms of Life. Swimming is the movement by humans or animals through Water, usually without artificial assistance Recreation or fun is the expenditure of time in a manner designed for therapeutic refreshment of one's Body or Mind. There are many standard sizes; the largest and deepest is the Olympic size. A pool can be built either above or in the ground, and from materials such as metal, plastic or concrete. The M acro E xpansion T emplate A ttribute L anguage complements TAL, providing macros which allow the reuse of code across Plastic is the general common term for a wide range of synthetic or semisynthetic organic solid materials suitable for the manufacture of industrial products Concrete is a construction material composed of Cement (commonly Portland cement) as well as other cementitious materials such as Fly ash and Slag

Pools that may be used by many people or by the general public are called public, while pools used exclusively by a few people or in a home are called private. Many health clubs, fitness centers and private clubs have public pools used mostly for exercise. A health club, also called fitness club, is a place which houses exercise equipment for the purpose of physical exercise Many hotels and massage parlors have public pools for relaxation. A hotel is an establishment that provides paid lodging usually on a short-term basis A massage parlor is a business where customers can receive a Massage. Hot tubs and spas are pools with hot water, used for relaxation or therapy, and are common in homes, hotels, clubs and massage parlors. A hot tub is a large home-made or manufactured tub or small pool full of heated water and used for soaking relaxation, Massage, or The term spa is associated with water treatment which is also known as Balneotherapy, Spa towns or Spa resorts offering such treatment or the medication Swimming pools are also used for diving, other sports, and training of lifeguards and astronauts. Diving off a deck into the Great South Bay of Long Islandjpg|thumb|A man dives into the Great South Bay of Long Island. A lifeguard is an Emergency service worker who is responsible for overseeing the Safety of the users of a recreational water feature such as a Swimming An astronaut or cosmonaut (космона́вт) is a person trained

Pools must be sanitized to prevent growth and spread of bacteria, viruses, algae and insect larvae that can cause disease. The Bacteria ( singular: bacterium) are a large group of unicellular Microorganisms Typically a few Micrometres in length bacteria have A virus (from the Latin virus meaning Toxin or Poison) is a sub-microscopic infectious agent that is unable Algae ( sing. alga are a large and diverse group of simple typically Autotrophic organisms ranging from Unicellular to Multicellular forms Insects ( Class Insecta) are a major group of Arthropods and the most diverse group of Animals on the Earth with over a million described A larva ( Latin; plural larvae) is a juvenile form of Animal with indirect development, undergoing Metamorphosis (for example A disease is an abnormal condition of an organism that impairs bodily functions and can be deadly This is done by using filters and chemical disinfectants such as chlorine, bromine or mineral sanitizers. Disinfectants are Antimicrobial agents that are applied to non-living objects to destroy Microorganisms, the process of which is known as disinfection. Chlorine (ˈklɔriːn from the Greek word 'χλωρóς' ( khlôros, meaning 'pale green' is the Chemical element with Atomic number 17 and Mineral sanitizers for the Swimming pool and Spa use Minerals Metals or elements derived from the natural environment to produce

Contents 1 History 2 Swimming pool records 3 Dimensions 3.1 Length 3.2 Width 3.3 Depth 4 Types 4.1 Ocean pools 4.2 Private pools 4.3 Public pools 4.4 Competition pools 4.5 Exercise pools 4.6 Hot tubs and spa pools 4.7 Infinity pools 5 Other uses 6 Sanitation 7 Winterization 7.1 Closing vinyl and fibreglass pools 7.2 Covers 7.2.1 Pool cover automation 7.2.2 Pool cover materials 7.2.2.1 Vinyl covers 7.2.2.2 Thermal bubble covers 7.2.2.3 Debris covers 8 Safety 9 Dress code 10 See also 11 References 12 External links

History

The "great bath" at the site of Mohenjo-Daro was most likely dug during the 3rd millennium BC. Mohenjo-daro (موئن جودڑو موئن جو دڙو मोहन जोदड़ो Mound of the Dead was one of the largest city-settlements of the Indus Valley Civilization This pool is 12 by 7 meters, is lined with bricks and was covered with a tar-based sealant. ^[1]

Ancient Greeks and Romans built artificial pools for athletic training in the palaestras, for nautical games and for military exercises. The term ancient Greece refers to the period of Greek history lasting from the Greek Dark Ages ca Ancient Rome was a Civilization that grew out of a small agricultural community founded on the Italian Peninsula as early as the 10th century BC For the sports arena in Philadelphia (Pennsylvania see Palestra. Roman emperors had private swimming pools in which fish were also kept, hence the Latin word for pool, piscina. Latin ( lingua Latīna, laˈtiːna is an Italic language, historically spoken in Latium and Ancient Rome. The first heated swimming pool was built by Gaius Maecenas of Rome in the first century BC. Caius Cilnius Maecenas (70 &ndash 8 BC was a confidant and political advisor to Octavian (who was to become the first Emperor of Rome as Caesar Augustus) as well Gaius Maecenas was a rich Roman lord and considered one of the first patrons of arts. ^[2]

Ancient Sinhalese built pairs of pools called "Kuttam Pokuna" in the kingdom of Anuradhapura, Sri Lanka in 4th century BC. Kuttam Pokuna History One of the best specimen of Bathing Tanks or Pools in ancient Sri Lanka is the pair of pools known as "Kuttam Pokuna" Anuradhapura, (අනුරාධපුර in Sinhala, அனுராதபுரம் in Tamil) is one of the ancient capitals of Sri Lanka, famous Sri Lanka, officially the Democratic Socialist Republic of Sri Lanka ( Sinhalese:, இலங்கை known as Ceylon before 1972 is an Island Those were decorated with flights of steps, punkalas or pots of abundance and scroll design. ^[3]

Swimming pools became popular in Britain in the mid 19th century. By 1837, six indoor pools with diving boards were built in London, England. London ( ˈlʌndən is the capital and largest urban area in the United Kingdom. England is a Country which is part of the United Kingdom. Its inhabitants account for more than 83% of the total UK population whilst its mainland ^[4] After the modern Olympic Games began in 1896 and included swimming races, the popularity of swimming pools began to spread (reference: Encyclopedia Britannica). The Olympic Games is an international Multi-sport event established for both summer and winter games In 1939, Oxford had its first major public indoor pool at Temple Cowley, and swimming began to take off. Oxford is currently bidding for the 2010 Wikimania Conference Oxford () is a city, and the County town of Oxfordshire, The Amateur Swimming Association was founded in 1869 in England,^[5] and the Oxford Swimming Club in 1909 with its home at Temple Cowley Pool. ^[6] The presence of indoor baths in the cobbled area of Merton Street, London may have persuaded the less hardy of the aquatic brigade to join. Merton Street is an historic and picturesque cobbled lane in central Oxford, England. So, bathers gradually became swimmers, and bathing pools swimming pools.

In the USA, the Racquet Club of Philadelphia clubhouse (1907) boasts one of the world's first modern above-ground swimming pools. Deep Eddy Pool is a historic man-made Swimming pool in Austin, Texas. The Racquet Club of Philadelphia (RCOP is Philadelphia Pennsylvania 's premiere squash, real tennis, and racquets facility The first swimming pool to go to sea on an ocean liner was installed on the White Star Line's Adriatic in 1907. The Oceanic Steam Navigation Company or White Star Line of Boston Packets, more commonly known as the White Star Line, was a prominent British Shipping RMS Adriatic was an Ocean liner belonging to the White Star Line. ^[7]

After World War I and the departure of "Long John" style swimming costumes, interest in competitive swimming grew. World War I (abbreviated WWI; also known as the First World War, the Great War, and the War to End All Standards improved and training became essential.

Home swimming pools became popular in the USA after World War II and the publicity given to swimming sports by Hollywood films like Esther Williams Million Dollar Mermaid made a home pool a desirable status symbol. World War II, or the Second World War, (often abbreviated WWII) was a global military conflict which involved a majority of the world's nations, including For the Fijian academic business woman see Esther Williams (academic Esther Jane Williams (born August 8 1921 is a retired More than 50 years later, the home or residential swimming pool is ubiquitous and even the smallest world nations enjoy a thriving swimming pool industry (e. g. New Zealand pop. 4,116,900 [Source NZ Census 7 March 2006] - holds the record in pools per capita with 65,000 home swimming pools and 125,000 spa pools). Events 161 - Roman Emperor Antoninus Pius dies and is succeeded by co-Emperors Marcus Aurelius and Lucius Verus Year 2006 ( MMVI) was a Common year starting on Sunday of the Gregorian calendar.

Swimming pool records

One of the largest swimming pools ever built was reputedly in Moscow after the Palace of Soviets remained uncompleted. Moscow (Москва́ romanised: Moskvá, IPA: see also other names) is the Capital and the largest city of The Palace of Soviets (Дворец Советов Dvorets Sovetov) was a project to construct an administrative center and a congress hall in Moscow, The foundations were converted into an open air swimming pool after the process of de-Stalinisation. The Cold War ensued as the USSR and the United States struggled indirectly for influence around the world ^[8] After the fall of communism, Christ the Saviour Cathedral was re-built (it had originally been on the site) between 1995 and 2000. Communism is a Socioeconomic structure that promotes the establishment of an egalitarian, classless, stateless Society based The Cathedral of Christ the Saviour (Хра́м Христа́ Спаси́теля is the tallest Eastern Orthodox Church in the world

According to the Guinness World Records, the largest swimming pool in the world is San Alfonso del Mar Seawater pool in Algarrobo, Chile. Guinness World Records, known until 2000 as The Guinness Book of Records (and in previous U San Alfonso del Mar is a resort located in the central coast of Chile, frequently noted because of its 1000-meter long 19-acre outdoor pool which holds a Guinness Chile, officially the Republic of Chile ( Spanish:) is a country in South America occupying a long and narrow Coastal strip wedged between the It is 1,013 m (3,324 ft) long and has an area of 8 ha (20 acres). It was completed in December 2006. ^[9]

The largest indoor wave pool in North America is at the West Edmonton Mall and the largest indoor pool is at the Neutral Buoyancy Lab in the Sonny Carter Training Center at NASA JSC in Houston. West Edmonton Mall (WEM located in Edmonton, Alberta, Canada is the largest Shopping mall in North America and the fourth largest ^[10][11] The recreational diving center Nemo 33 near Brussels, Belgium is home to the world's deepest swimming pool. Nemo 33 is a recreational Scuba diving center in Uccle, Belgium near Brussels that is home to the world's deepest Swimming pool. Brussels (Bruxelles pronounced; Brussel pronounced) officially the Brussels Capital-Region, is The Kingdom of Belgium is a Country in northwest Europe. It is a founding member of the European Union and hosts its headquarters as well as those The pool has two large flat-bottomed areas at depth levels of 5 m (16 ft) and 10 m (32 ft), and a large circular pit descending to a depth of 33 m (108 ft). ^[12]

The Fleishhacker Pool in San Francisco, California was the largest swimming pool in the United States. Fleishhacker Pool, the largest swimming pool in the United States, was located in the far southwest corner of the city of San Francisco California next to the The City and County of San Francisco is the fourth most populous city Opened on 23 April 1925, it measured 300 m by 45 m (1,000 ft by 150 ft) and was so large that the lifeguards required kayaks for patrol. Events 215 BC - A temple is built on the Capitoline Hill dedicated to Venus Erycina to commemorate the Roman defeat at Year 1925 ( MCMXXV) was a Common year starting on Thursday (link will display the full calendar of the Gregorian calendar. A kayak is a small human-powered Boat. It typically has a covered deck and a cockpit covered by a Spraydeck. It was closed in 1971 due to low patronage. ^[13]

Dimensions

Length

Most pools in the world are measured in metres, but in the United States pools are almost always measured in feet and yards. The United States of America —commonly referred to as the A foot (plural feet or foot; symbol or abbreviation ft or sometimes &prime – the prime symbol) is a non-SI unit A yard (abbreviation yd) is a unit of Length in several different systems including English units Imperial units and United In the United Kingdom most pools are in metres, but older pools measured in yards still exist. The United Kingdom of Great Britain and Northern Ireland, commonly known as the United Kingdom, the UK or Britain,is a Sovereign state located In the US pools tend to either be 25 yards (SCY-short course yards), 25 metres (SCM-short course metres) or 50 metres (long course). In swimming Short Course (abbreviated SC stands for a competition organized in a pool of 25 Metres in length instead of a regular Olympic size swimming pool of An Olympic-size swimming pool is the type of Swimming pool used in the Olympic Games and other "long course" events US high schools and the NCAA conduct short course (25 yards) competition. The National Collegiate Athletic Association ( NCAA, often pronounced "N-C-Double-A" is a voluntary association of about 1200 institutions conferences organizations There also exist many pools 33⅓ m long, so that 3 lengths = 100 m. This is sometimes jokingly referred to as "inter-course". This pool dimension is commonly used to accommodate water polo. Water polo is a team water sport A team consists of six field players and one Goalkeeper.

USA Swimming (USA-S) swims in both metric and non-metric pools. USA Swimming is the national governing body for Competitive swimming in the United States. However, the international standard is metres, and world records are only recognized when swum in 50 m pools (or 25 m for short course).

In general, the shorter the pool, the faster the time for the same distance, since the swimmer gains speed from pushing off the wall after each turn at the end of the pool.

Width

Most European pools are between 10 m and 50 m wide.

Depth

The depth of a swimming pool depends on the purpose of the pool, and whether it is open to the public or strictly for private use. If it is a private casual, relaxing pool, it may go from 1. 0 m to 2. 0 m (3 to 7 feet) deep. If it is a public pool designed for diving, it may slope from 3. 0 to 5. 0 m (10 to 16 feet) in the deep end. A children's play pool may be from 30 cm to 1. 2 m (1 to 4 feet) deep. Most public pools have differing depths to accommodate different swimmer requirements. In many jurisdictions, it is a requirement to show the water depth with clearly marked depths affixed to the pool walls.

Types

Ocean pools

In the early 20th century, especially in Australia, ocean pools were built typically on headlands by enclosing part of the rock shelf, with water circulated through the pools by flooding from tidal tanks or by regular flooding over the side of the pools at high tide. Sydney (ˈsɪdniː is the most populous city in Australia, with a Metropolitan area population of approximately 4 For a topic outline on this subject see List of basic Australia topics. For a topic outline on this subject see List of basic Australia topics. There were often separate pools for women and men, or the pool was open to the sexes at different times with a break for bathers to come without fear of observation by the other sex. Segregated changing sheds and showers were provided. ^[14] These were the fore-runners of modern 'Olympic' pools. A variation was the later development of sea- or harbour-side pools that circulated sea water using pumps. The pool of this type at Balmain was the training ground for Olympian, Dawn Fraser. Balmain is a Suburb in the inner-west of Sydney, in Dawn Lorraine Fraser AO, MBE (born on 4 September 1937 is an Australian champion swimmer

Private pools

Private pools are usually smaller than public pools, on average 16' x 32' (4. 8m x 9. 6 m) to 20' x 40' (6m x 12 m) whereas public pools usually start at 80 0" (25. 0m). Home pools can be permanently built-in, or be assembled above ground and disassembled after summer. Privately owned outdoor pools in backyards or gardens started to proliferate in the 1950s in regions with warm summer climates, particularly in the United States. In some warm-weather US locations, such as Florida and Arizona, home pools are so common that it is rare to find a new house being built without a pool being considered in the design. Florida ( is a state located in the southeastern region of the United States, bordering Alabama to the northwest and Georgia to the The State of Arizona ( is a state located in the southwestern region of the United States.

Private pools are increasingly a feature of homes in greater latitudes. Latitude, usually denoted symbolically by the Greek letter phi ( Φ) gives the location of a place on Earth (or other planetary body north or south of the For example, in London many larger homes are now refurbished with indoor pools, usually in the basement or in a conservatory. London ( ˈlʌndən is the capital and largest urban area in the United Kingdom. A basement is one or more floors of a building that are either completely or partially below the Ground floor. In some European cities, including Munich, it is relatively common for people living in older properties to convert existing internal motorcar garages into indoor pool areas. Munich (München; Minga is the capital city of Bavaria, Germany. A residential garage is part of a home or an associated building designed or used for storing a vehicle or vehicles

Construction methods for private pools vary greatly. There are several distinct construction methods for private (home Swimming pools which are typically called " Concrete " " Vinyl liner" and The main types of in-ground pools are concrete, vinyl liner, and fiberglass. Concrete is a construction material composed of Cement (commonly Portland cement) as well as other cementitious materials such as Fly ash and Slag A vinyl compound is any Organic compound that contains a vinyl group (also called ethenyl) &minus C[[Hydrogen H]] =CH sub>2 Fiberglass (also called fibreglass and glass fibre see Spelling differences) is material made from extremely fine Fibers of Glass. Above-ground pools (also called "on-ground pools") are usually cheaper to build. They are especially popular in places where ground freezing makes excavation difficult and threatens damage to the pool structure.

Inexpensive temporary PVC pools can be bought in supermarkets and taken down after summer. Customer divider barjpg|thumb|In supermarkets sellers periodically change prices for classes of goods in response to market conditions rather than negotiating the price of each good They are used mostly outdoors in yards, are typically shallow, and often their sides that are inflated with air to stay rigid. When finished, the water and air can be let out and this type of pool can be folded up for convenient storage. They are regarded in the swimming pool industry as "splasher" pools intended for cooling off and amusing toddlers and children, not for swimming.

Some people use hot tubs and spas at home to soak their bodies in water for recreation. A hot tub is a large home-made or manufactured tub or small pool full of heated water and used for soaking relaxation, Massage, or The term spa is associated with water treatment which is also known as Balneotherapy, Spa towns or Spa resorts offering such treatment or the medication

Many toys are available for children and other people to play with in pool water. This article is about playthings For other uses of the term see Toy (disambiguation. They are often blown up with air so they are soft but still reasonably rugged, and can float in water.

Many countries now have strict pool fencing laws for private swimming pools, which require pool areas to be isolated so that unauthorized children younger than six years cannot enter. A pool fence is a type of Fence placed around Backyard Swimming pools commonly to improve pool safety and to help prevent small children or pets Many countries require a similar level of protection for the children residing in or visiting the house, although many pool owners prefer the visual aspect of the pool in close proximity to their living areas, and will not provide this level of protection. There is no general consensus between states or countries on the requirements to fence private swimming pools, and in many places they are not required at all, particularly in rural settings.

Public pools

Public pools are often found as part of a larger leisure centre or recreational complex. These centres often have more than one pool, such as an indoor heated pool, an outdoor saltwater or unheated chlorinated pool, a shallower children's pool, and a paddling pool for toddlers and infants. Chlorination is the process of adding the element Chlorine to Water as a method of Water purification to make it fit for human consumption as Toddler is a common term for a young Child who is learning to walk or "toddle", generally considered to be the second stage of development after infancy There may also be a sauna and one or more hot tubs or spa pools ("jacuzzis"). A sauna (ˈsɔːnə or as Finnish) is a small room or house designed as a place to experience dry or wet heat sessions or an establishment with one or more of these and auxiliary A hot tub is a large home-made or manufactured tub or small pool full of heated water and used for soaking relaxation, Massage, or The term spa is associated with water treatment which is also known as Balneotherapy, Spa towns or Spa resorts offering such treatment or the medication Jacuzzi is a company that produces whirlpool Bathtubs History Around 1900 seven brothers named Jacuzzi (pronounced yah-KUH-tzih immigrated

Public pools may belong to a hotel or holiday resort, as an amenity for the recreation of their guests. A hotel is an establishment that provides paid lodging usually on a short-term basis A resort is a place used for Relaxation or Recreation, attracting visitors for Holidays or Vacations Resorts are places towns or sometimes If a pool is located in a separate building, the building is called a "natatorium". The building sometimes also has facilities for related activities, such as a diving tank. Outdoor pools are common in warmer climates. Larger pools sometimes have a diving board affixed at one edge above the water. A springboard or diving board is used for Diving and is a board that is itself a spring, i Diving pools should be deep enough that divers are not injured.

Many public swimming pools are rectangles 25 m or 50 m long, but may be any size and shape desired. In Geometry, a rectangle is defined as a Quadrilateral where all four of its angles are Right angles A rectangle with vertices ABCD would be denoted as There are also elaborate pools with artificial waterfalls, fountains, splash pads, wave machines, varying depths of water, bridges, and island bars. A waterfall is usually a geological formation resulting from water often in the form of a Stream, flowing over an Erosion -resistant rock A traditional fountain is an arrangement where water issues from a source ( Latin fons) fills a basin of some kind and is drained away A splash pad is an area for Water play that has no standing water A bridge is a Structure built to span a Gorge, Valley, Road, railroad track, River, Body of water

There are often lockers for clothing and other belongings. The lockers often require a coin to be inserted as deposit or payment. There are often showers ready for use - sometimes mandatory - before and/or after swimming.

Wading pools are shallow bodies of water intended for use by small children, usually in parks. A park is a protected area of Land and Water, usually in its natural or semi-natural (landscaped state and set aside for some purpose often to do with human Concrete wading pools come in many shapes, traditionally rectangle, square or circle. In Geometry, a rectangle is defined as a Quadrilateral where all four of its angles are Right angles A rectangle with vertices ABCD would be denoted as Classification A square (regular Quadrilateral) is a special case of a Rectangle as it has four right angles and equal parallel sides Circles are simple Shapes of Euclidean geometry consisting of those points in a plane which are at a constant Distance, called the They are filled and drained daily due to lack of a filter system. Staff chlorinate the water to ensure health and safety standards.

Competition pools

Federation Internationale de la Natation (FINA, International Swimming Federation) sets widely recognized standards for competition pools: 25 m (~82 feet) or 50 m (~164 feet) long and at least 1. 35 m (~4. 4 feet) deep. Competition pools are generally indoors and heated to enable their use all year round, and to more easily comply with the regulations regarding temperature, lighting, and Automatic Officiating Equipment and equipment.

An Olympic sized swimming pool (first used at the 1924 Olympics) is a pool that meets FINA's additional standards for the Olympic Games and for world championship events. An Olympic-size swimming pool is the type of Swimming pool used in the Olympic Games and other "long course" events It must be 50 m (~164 feet) in length by 25 m (~82 feet) wide, divided into eight lanes of 2. 5 m (~8. 2 feet) each plus two areas of 2. 5 m (~8. 2 feet) at each side of the pool. The water must be kept at 25–28°C (77-82. 4°F) and the lighting level at greater than 1500 lux. LUX is the principal centre for the promotion and distribution of experimental Film and Video works in the UK. Depth must be at least 2 m (~6. 5 feet), and there are also regulations for color of lane rope, positioning of backstroke flags (5 meters from each wall), and so on. Pools claimed to be "Olympic pools" do not always meet these regulations, as FINA cannot police use of the term. Touchpads are mounted on both walls for long course meets and each end for short course.

A pool may be referred to as fast or slow, depending on its physical layout. ^[15] Some design considerations allow the reduction of swimming resistance making the pool faster. In Fluid dynamics, drag (sometimes called fluid resistance) is the force that resists the movement of a Solid object through a Fluid (a Namely, proper pool depth, elimination of currents, increased lane width, energy absorbing racing lane lines and gutters, and the use of other innovative hydraulic, acoustic and illumination designs.

Exercise pools

In the last two decades, a new style of pool has gained popularity. These consist of a small vessel (usually about 2. 5 m x 5 m) in which the swimmer swims in place, either against the push of an artificially generated water current or against the pull of restraining devices. These pools have several names, such as swim spas, swimming machines, or swim systems. A swimming machine is a Resistance swimming apparatus often self-contained enabling the swimmer to swim in place They are all examples of different modes of resistance swimming. Resistance swimming is a form of Swimming Exercise undertaken either for athletic or therapeutic purposes

Hot tubs and spa pools

Hot tubs and spa pools are common heated pools used for relaxation and sometimes for therapy. In many places mineral water is often colloquially used to mean Carbonated water (which is usually carbonated mineral water as opposed to tap water ( Ripuarian: Oche, Dutch: Aken, Spanish: Aquisgrán, Italian: Aquisgrana, French, Germany, officially the Federal Republic of Germany ( ˈbʊndəsʁepuˌbliːk ˈdɔʏtʃlant is a Country in Central Europe. A hot tub is a large home-made or manufactured tub or small pool full of heated water and used for soaking relaxation, Massage, or The term spa is associated with water treatment which is also known as Balneotherapy, Spa towns or Spa resorts offering such treatment or the medication The "hippie" era (1960's and 70's) popularized them in America in songs and movies. A spa is also called a "jacuzzi" in USA since the word became a generic after plumbing component manufacturer Jacuzzi introduced the "Spa Whirlpool" in 1968. Jacuzzi is a company that produces whirlpool Bathtubs History Around 1900 seven brothers named Jacuzzi (pronounced yah-KUH-tzih immigrated

Air bubbles may be introduced into the nozzles via an air-bleed venturi pump that combines cooler air with the incoming heated water to cool the pool if the temperature rises uncomfortably high. A nozzle is a mechanical device or Orifice designed to control the characteristics of a Fluid flow as it exits (or enters an enclosed chamber or Pipe. An aspirator, also called an Eductor-jet pump or filter pump is a device that produces Vacuum by means of the Venturi effect. Some spas have a constant stream of bubbles fed via the seating area of the pool, or a footwell area. This is more common as a temperature control device where the heated water comes from a natural (uncontrolled heat) geothermal source, rather than artificially heated. Water temperature is usually very warm to hot — 38°C to 42°C (100 to 108 °F), so bathers usually stay in for only 20 to 30 minutes. Bromine or mineral sanitizers are often recommended as sanitizers for spas because chlorine dissipates at a high temperature thereby heightening its strong chemical smell. Mineral sanitizers for the Swimming pool and Spa use Minerals Metals or elements derived from the natural environment to produce Chlorine (ˈklɔriːn from the Greek word 'χλωρóς' ( khlôros, meaning 'pale green' is the Chemical element with Atomic number 17 and Ozone is an effective bactericide and is commonly included in the circulation system with cartridge filtration, but not with sand media filtration due to clogging problems with turbid body fats. OZONE is an object oriented Operating system written in the C programming language.

Commercial spas are common in the swimming pool area or sauna area of a health club or fitness centre, in men's clubs, women's clubs, massage parlours, brothels, motels and exclusive five star hotel suites. A sauna (ˈsɔːnə or as Finnish) is a small room or house designed as a place to experience dry or wet heat sessions or an establishment with one or more of these and auxiliary A health club, also called fitness club, is a place which houses exercise equipment for the purpose of physical exercise A massage parlor is a business where customers can receive a Massage. For the 2008 film of this name see The Brothel. For the television series of this name see Cathouse The Series. Entering dictionaries after World War II, the word motel, a Portmanteau of motor and hotel or motorists' hotel, referred Stars are often used as symbols for classification purposes They are used by reviewers for ranking things such as movies TV shows restaurants and hotels Spa clubs may have very large pools, some segmented into increasing temperatures. In Japan, men's clubs with many spas of different size and temperature are common. For a topic outline on this subject see List of basic Japan topics. Commercial spas are generally made of concrete, with a mosaic tiled interior. Concrete is a construction material composed of Cement (commonly Portland cement) as well as other cementitious materials such as Fly ash and Slag Art History Mosaics of the 4th century BC are found in the Macedonian palace-city of Aegae, and they enriched the floors of Hellenistic A tile is a manufactured piece of hard-wearing material such as Ceramic, stone, metal or even Glass. Hot tubs are typically made somewhat like a wine barrel with straight sides, from wood such as Californian redwood held in place by metal hoops. The use of Oak in Wine plays a significant role in Winemaking and can have a profound effect on the resulting wine impacting the color flavor Sequoia sempervirens is the sole living Species of the Genus Sequoia in the cypress family Cupressaceae (formerly Total immersion (especially the head) is not recommended in commercial spas due to unknown health risks posed by the large number of bathers and their unknown activities.

Home spas are a world-wide retail item in western countries since the 1980s, and are sold in dedicated spa stores, pool shops, department stores, the Internet, and catalog sales books. A department store is a Retail establishment which specializes in selling a wide range of products without a single predominant merchandise line. The Internet is a global system of interconnected Computer networks They are almost always made from heat-extruded acrylic sheet Perspex, often colored in marble look-alike patterns. Poly(methyl methacrylate ( PMMA) or poly(methyl 2-methylpropenoate is a Thermoplastic and transparent Plastic. Poly(methyl methacrylate ( PMMA) or poly(methyl 2-methylpropenoate is a Thermoplastic and transparent Plastic. Marble is a nonfoliated Metamorphic rock resulting from the Metamorphism of Limestone, composed mostly of Calcite (a crystalline form of They rarely exceed 8 ft² (2,400mm²) and are typically 3 ft 6 in (1 m) deep, restricted by the availability of the raw sheet sizes (typically manufactured in Japan). There is often a mid-depth seating or lounging system, and contoured lounger style reclining seats are common. Upmarket spas include various jet nozzles (massage, pulsating etc. ), a drinks tray, lights, LCD flat-screen TV sets and other features that make the pool a recreation center. Television ( TV) is a widely used Telecommunication medium for sending ( Broadcasting) and receiving moving Images, either monochromatic Due to their family-oriented nature, home spas are normally operated from 36°C to 39°C (97-102°F). Many pools are incorporated in a redwood or simulated wood surround, and are termed "portable" as they may be placed on a patio rather than sunken into a permanent location. A patio (from the Spanish patio meaning 'back garden' or 'backyard' is an outdoor space generally used for dining or Recreation that often adjoins a Some portable spas are shallow and narrow enough to fit sideways through a standard door and be used inside a room. Low power electric immersion heaters are common with home spas.

Infinity pools

Main article: Infinity pool

An infinity pool (also named negative edge or vanishing edge pool) is a swimming pool which produces a visual effect of water extending to the horizon, vanishing, or extending to "infinity". An infinity edge pool (also named negative edge zero edge "disappearing edge" or vanishing edge pool) is a Swimming pool which produces Often, the water appears to fall into an ocean, lake, bay, or other similar body of water. The effect is best captured in a pool where the liner color matches the body of water it is "falling" into.

Other uses

Swimming pools are also used for events such as synchronized swimming, water polo and canoe polo as well as for teaching diving and lifesaving techniques. Water polo is a team water sport A team consists of six field players and one Goalkeeper. Canoe polo (called kayak polo in some countries is a competitive ball Sport played on water in a defined "field" between two teams of 5 players each Diving off a deck into the Great South Bay of Long Islandjpg|thumb|A man dives into the Great South Bay of Long Island. A lifeguard is an Emergency service worker who is responsible for overseeing the Safety of the users of a recreational water feature such as a Swimming They have also been used for specialist tasks such as teaching water-ditching survival techniques for helicopter and submarine crews and astronaut training. An astronaut or cosmonaut (космона́вт) is a person trained Round-cornered, irregular swimming pools, drained of water, were the first surfaces used for vertical skateboarding. Skateboarding is the act of riding and performing tricks using a Skateboard.

Sanitation

Main article: Swimming pool sanitation

Swimming pool water must be maintained at low levels of bacteria and viruses to prevent the spread of diseases and pathogens between users. Swimming pool sanitation refers to both visual clarity and levels of Microflora, such as Bacteria and Viruses in Swimming pools The goal of sanitation The Bacteria ( singular: bacterium) are a large group of unicellular Microorganisms Typically a few Micrometres in length bacteria have A virus (from the Latin virus meaning Toxin or Poison) is a sub-microscopic infectious agent that is unable A disease is an abnormal condition of an organism that impairs bodily functions and can be deadly A pathogen (from Greek πάθος pathos "suffering passion" and γἰγνομαι (γεν- gignomai (gen- "I give birth to" infectious Bacteria, algae and insect larvae can also enter the pool without help from swimmers, and cause disease to swimmers and other people in the area. Algae ( sing. alga are a large and diverse group of simple typically Autotrophic organisms ranging from Unicellular to Multicellular forms Insects ( Class Insecta) are a major group of Arthropods and the most diverse group of Animals on the Earth with over a million described A larva ( Latin; plural larvae) is a juvenile form of Animal with indirect development, undergoing Metamorphosis (for example

Pumps and mechanical filters are often used to filter such pathogens out of the water. Chemical disinfectants, such as hypochlorous acid, sodium hypochlorite (household bleach), bromine or mineral sanitizers, are used to make the water inhospitable to pathogens. Disinfectants are Antimicrobial agents that are applied to non-living objects to destroy Microorganisms, the process of which is known as disinfection. Hypochlorous acid ( IUPAC name chloric(I acid) is a weak Acid with the Chemical formula HOCl Sodium hypochlorite is a Chemical compound with the formula NaClO Mineral sanitizers for the Swimming pool and Spa use Minerals Metals or elements derived from the natural environment to produce

The wave of recent mortgage foreclosures in the United States has resulted in many people walking away from their homes without emptying their swimming pools. The United States of America —commonly referred to as the This resulted in the pools turning green with algae and becoming mosquito breeding grounds in less than a week. ^[16]

Winterization

In areas which reach freezing temperature, it is important to close a pool properly. This varies greatly between inground and aboveground pools. By taking steps to properly secure the pool, it lessens the likelihood that the superstructure will be damaged or compromised by freezing water.

Closing vinyl and fibreglass pools

In preparation for freezing temperatures, an in-ground swimming pool's pipes must be emptied. An above-ground pool should also be closed, so that ice does not drag down the pool wall, collapsing its structure. The plumbing is sealed with air, typically with rubber plugs, to prevent cracking from freezing water. The pool is typically covered to prevent leaves and other debris from falling in. The cover is attached to the pool typically using a stretch cord, similar to a bungee cord and hooks fitted into the pool surround. A bungee cord is an elastic cord composed of one or more elastic strands forming a core covered in a woven sheath usually of nylon or cotton The skimmer is closed off or a floating device is placed into it to prevent it from completely freezing and cracking. Floating objects such as life rings or basketballs can be placed in the pool to avoid its freezing under the cover. Basketball is a team Sport in which two teams of five active players each try to score points against one another by propelling a ball through a 10 feet (3 m Drain plugs on the pool filter are removed after the filter has been cleaned. The pool pump motor is taken under cover. For information on Wikipedia project-related discussions see WikipediaVillage pump. Winter chemicals are added to keep the pool clean.

In climates where there is no risk of freezing, closing down the pool for winter is not so important. Typically, the thermal cover is removed and stored. Winter sunlight can create an algae mess when a cover that has been left on all winter is removed. Algae ( sing. alga are a large and diverse group of simple typically Autotrophic organisms ranging from Unicellular to Multicellular forms The pool is correctly pH-balanced and super-chlorinated. pH is the measure of the acidity or alkalinity of a Solution. One litre algaecide for every 50,000 litres of pool water should be added, and topped up each month. The pool should be filtered for one to two hours daily to keep the automated chlorination system active.

Covers

Swimming pool heating costs can be significantly reduced by using a pool cover. Use of a pool cover also can help reduce the amount of chemicals (chlorine, etc) required by the pool. Outdoor pools gain heat from the sun, absorbing 75%–85% of the solar energy striking the pool surface. Though a cover decreases the total amount of solar heat absorbed by the pool, the cover eliminates heat loss due to evaporation and reduces heat loss at night through its insulating properties.

The heating effectiveness of a cover depends on type. A transparent bubble cover is the most effective, as it allows the largest amount of solar flux into the pool itself. A darker cover absorbs more sunlight directly, allowing temperature to rise faster, but ultimately prevents the pool from reaching as high a temperature as a clear cover. ^[17]

Pool cover automation

A pool cover can be either manually, semi-automatically, or automatically operated. Manual covers can be folded and stored in a convenient location. Pool cover reels can also be used to help manually roll up the pool cover. The reel, usually on wheels, can be rolled out of the way.

Semi-automatic covers use a motor-driven reel system. They use electrical power to roll and unroll the cover, but usually require someone to pull on the cover when unrolling, or guide the cover onto the reel when rolling up the cover. Semi-automatic covers can be built into the pool deck surrounding the pool, or can use reels on carts.

Automatic covers have permanently mounted reels that automatically cover and uncover the pool at the push of a button. They are the most expensive option, but are also the most convenient.

Some pool covers fit into tracks along the sides of the pool. This prevents anything or anybody from getting into the pool. They even support the weight of several people. They can be run manually, semi-automatically, or automatically. Safety covers may be required by inspectors for public pools. ^[17]

Pool cover materials

There are three main materials used for pool covers: Vinyl, thermal bubble and debris.

Vinyl covers

Vinyl covers consist of a heavier material and have a longer life expectancy than bubble covers. Insulated vinyl covers are also available with a thin layer of flexible insulation sandwiched between two layers of vinyl. ^[17]

Thermal bubble covers

Thermal bubble covers are lightweight UV stabilized floating covers designed to minimize heat loss on heated swimming pools. Ultraviolet ( UV) light is Electromagnetic radiation with a Wavelength shorter than that of Visible light, but longer than X-rays Typically they are only fitted in spring and fall (autumn) when the temperature difference between pool water and air temperature is greatest. They raise temperature of a pool by around 20 °Fahrenheit after being on the pool for a week. Most swimming pool heat loss is through evaporation^[18] .

Bubble covers are typically applied and removed by being rolled up on a device fitted to one side of the pool (see illustration). Covers fall apart after 4 or 5 years due to sun exposure, overheating in the sun while off the pool, and chlorine attacking the plastic.

Bubble covers should be removed during super chlorination.

These covers are mandatory to be fitted to all pools in areas of Australia that have experienced drought since 2006. For a topic outline on this subject see List of basic Australia topics. This is an effort to conserve water, as much water evaporates and transpires.

Debris covers

These covers are typically attached all winter, by hooked bungee cords or hooked springs connected to the pool deck, and are usually made of black or green fine PVC mesh. They are designed to stop leaf debris from entering the pool. They also provide some safety for animals and small children, but should not be relied on. They are not popular in warmer climates, due to the five to ten minutes it takes to fit/remove, making them inconvenient for repeated application and removal.

Safety

Pools present a significant risk of infant and toddler death due to drowning. Swifts Creek is a rural community located between Omeo and Ensay on the Great Alpine Road in East Gippsland, Victoria, Australia Drowning is Death as caused by suffocation when a liquid causes interruption of the body's absorption of oxygen from the air leading to Asphyxia. In regions where residential pools are common, drowning is a major cause of childhood fatalities. Therefore it is advisable to closely watch small children around swimming pools, especially private pools that do not have professional lifeguards. A lifeguard is an Emergency service worker who is responsible for overseeing the Safety of the users of a recreational water feature such as a Swimming Adults are more likely to be aware of risks, but it is still a good idea to have more than one person around when using a private pool. As a precaution, many municipalities have by-laws that require that residential pools be enclosed with fencing to restrict unauthorized access.

In public pools there is a lower risk of accident, with trained lifeguards on duty whenever the pool is open. Because of the risk of drowning and the desire for greater safety, and technological advances that make such safety possible, more and more public pools are equipped with computer-aided drowning prevention or other forms of electronic and sometimes automated safety and security systems. Pool Safety Cameras are video monitoring systems ostensibly designed to reduce Drowning deaths in public and private pools. Among these are the Poseidon system, Swimguard, and the Drowning Early Warning System (DEWS).

The best way to ensure safety around pools is to be educated. Knowing how a swimming pool works greatly improves safety. Long haired individuals must avoid water inlets. These inlets, also known as skimmers, are rectangular holes on the wall that are sometimes partly or completely underwater. In private pools there can be one to two inlets, in public pools five to twenty. Also to be avoided are the main drains, usually identified as round mesh covered objects on the pool floor, as poor design can occasionally cause a safety problem. Building codes and product standards have eliminated these hazards for current designs, but not all pools are up to standard.

Also the bigger the body of water, the greater force it needs to have the water circulating. Stronger water pumps are used on large pools to keep them healthy, so extra care must be taken when swimming along the sides or floor of the pool.

People with recent piercings are advised to keep those from being submerged in pools, to avoid them being infected. Body piercing is the practice of puncturing or cutting a part of the Human body, creating an opening in which jewelry may be worn An infection is the detrimental Colonization of a host Organism by a foreign Species.

Suspended ceilings in indoor swimming pools are safety-relevant components. As was demonstrated by the collapses of the ceiling of the Uster (Switzerland) indoor swimming pool (1985) and again at Steenwijk (Netherlands, 2001), attention must be paid to selecting suitable materials and inspecting the state of such components. Uster is a city and capital of the district Uster in the Swiss canton of Zürich. Switzerland (English pronunciation; Schweiz Swiss German: Schwyz or Schwiiz Suisse Svizzera Svizra officially the Swiss Confederation Steenwijk is a village in the Dutch province of Overijssel. It is located in the municipality of Steenwijkerland. The Netherlands ( Dutch:, ˈnedərlɑnt is the European part of the Kingdom of the Netherlands, which consists of the Netherlands the Netherlands The reason for the failures was stress corrosion cracking of metal fastening components made of stainless steel^[19]. Fracture mechanics --> Stress corrosion cracking ( SCC) is the unexpected sudden failure of normally Ductile metals or tough Thermoplastics In Metallurgy, stainless steel is defined as a Steel Alloy with a minimum of 11

There is also the problem with chemical exposure from chlorinated swimming pools. Numerous scientific studies have shown increased instances of Asthma of those who swim regularly or those who work in and around indoor swimming pools. Another study with children found that kids who swam in indoor swimming pools for 1. 8 hours or more a week had lung conditions similar to that of a heavy smoker. Also chlorine exposure from swimming pools has been shown to increase the risk of bladder and kidney cancer by more than 56% and it was also noted in the 2000 Olympics in Sydney Australia 25% of the U. S Olympic swim team suffered from some level of Asthma^[20]

Dress code

In public swimming pools dress code may be stricter than on public beaches, and in indoor pools stricter than outdoor pools. Clothing is an aspect of Human physical appearance, and like other aspects of human physical appearance it has social significance For example, in countries where women can be topless on the beach, this is often not allowed in a swimming pool, especially one indoors (see swimsuit). A swimsuit, bathing suit or swimming costume is an item of Clothing designed to be worn for Swimming.

Dress codes are also stricter in pools than on beaches: wearing shoes, and a shirt, on a beach is acceptable, but often not in a pool. Indoor pools have stricter dress codes than outdoor pools: in outdoor pools, men are often allowed to wear t-shirts for modesty or for protection from sunburn, but in indoor pools they must usually go shirtless. At beaches, many people swim with clothes on and wear beachwear, but at pools (especially indoor pools) more minimal attire is often worn, such as lycra briefs for men or lycra one-piece tanksuits for women. Beachwear refers to clothing suitable for wearing on a Beach or Urban beach. Spandex or elastane is a Synthetic fiber known for its exceptional elasticity. The maillot is the fashion designer's name for a woman's One-piece swimsuit. Swimming with clothes on (for example, as practice for the prevention of drowning, as one might fall off a boat clothed) often results in objections from lifeguards at pools, especially indoor pools. In France, board shorts are usually not allowed for hygiene reasons. Boardshorts are a style of men's and recently women's Swimwear that have long been associated with such aquatic sports as Surfing and Wakeboarding In Scandinavian countries and in particular Iceland, rules about clothing and hygiene are especially strict. Terminology and usage As a cultural term "Scandinavia" has no official definition and is subject to usage by those who identify with the culture in question as well Iceland, officially the Republic of Iceland ( ( Ísland or Lýðveldið Ísland ( ^[21] More recently, dress codes in many pools were relaxed to allow more modesty. Many pool operators allow people to swim fully clothed in clothes they only use in the pool if they shower in these clothes before entering the pool.

For diving from towers perhaps 10 m high, sometimes bathing suits are doubled up (i. e. , men will often wear one brief inside another) so that the swimsuit does not rip on impact with the water. While splashing around on beaches, especially on urban beaches, looser fitting bathing attire that is more modest is often worn. An urban beach, or urbeach,is defined as a space that includes an intellectually artistically or culturally sophisticated water feature that is also

See also

• Bather load
• Beach
• Lido
• Pool fence
• Swimming pool games

References

External links

• How Stuff Works: Swimming pools - Explains how pools work
• Swimmer's Guide - Comprehensive International directory of swimming pools
• Pool and Spa Safety Publications from the U. S. Consumer Product Safety Commission
• The Association of Pool & Spa Professionals (APSP) - leading trade association of the U. The United States Consumer Product Safety Commission (U S CPSC is an independent agency of the U S. pool/spa and hot tub industry
• Swimming Pool and Trade Association - UK Swimming Pool Governing Body

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