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One can distinguish private and public ones; the private ones are usually outdoors; for the public ones we can distinguish those outdoors, those indoors, and complexes with both. In some parts of the world, a swimming pool for private use is considered a status symbol. Swimming pools can be constructed either above ground (generally constructed from plastic and metal), or in the ground (usually concrete lined).
A common misconception about swimming pools is that chlorine is added to the water to stop the growth of bacteria. Chloride ions are actually added to the pool, if pure chlorine was added, swimmers would be instantly killed! One alternative form of chlorination is to have a salt water pool, where the chlorine ions are produced directly in the pool water by electrolysis. Some recent studies have suggested that swimming pool chlorination may contribute to higher rates of childhood asthma, leading to the development of (currently expensive) chlorine-free pool filter systems, which sterilise the water exposing it to powerful ultra-violet light.
The correct management of a backyard swimming pool is a difficult and time-consuming task. The chemical balance of the water has to be carefully monitored to make sure that it does not become fouled with algae, or grow too much bacteria. Either of these will make the water smell and look unpleasant, and can be a serious health hazard . The water must also be kept clear of debris such as fallen leaves and sticks, as these encourage fouling, and they become very slippery and dangerous as they start to decompose. Most people keep their pool either covered over or drained entirely during the months of the year in which it is not in use, as this is the easiest way to keep it sanitary. Public and competitive swimming pools are generally indoor pools — covered with a roof, and heated — to enable their use all year round. It is always advisable to keep a close watch on small children around swimming pools, as drowning is a major cause of child deaths.
Public pools are often found as part of a larger leisure centre or recreational complex. These centres often have more than one pool for example an indoor heated pool, an outdoor saltwater or unheated chlorinated pool, a shallower 'children's pool', and a paddling pool for toddlers and infantThe word Infant derives from the Latin in-fans meaning unable to speak''. It is commonly used as a slightly more formal word for baby (the youngest category of child). A newborn baby is known as a neonate (neonatal after the final stage of gestation.s. There may also be a saunaA sauna the wet version also called steam bath is a small room or house designed as a place to experience dry or wet/dry heat sessions, or an establishment with one or more of these and auxiliary facilities, or the act of using a sauna. Taking a sauna is area. In the swimming pool area and/or in the saunaA sauna the wet version also called steam bath is a small room or house designed as a place to experience dry or wet/dry heat sessions, or an establishment with one or more of these and auxiliary facilities, or the act of using a sauna. Taking a sauna is area there may be one or more jacuzziJacuzzi is a brand of baths and saunas. The first product was a bath with massaging jets and the trademarked name is commonly used to refer to any bath with water jets. The Jacuzzi Whirlpool Bath was invented by Roy Jacuzzi.s, see below.
If a swimming pool (sometimes combined with facilities for allied sports and activities, such as a diving tank) is in a separate building, the building is called a "natatorium".
Many public swimming pools are rectangleIn geometry, a rectangle is a defined as a quadrilateral polygon in which all four angles are right angles. From this definition, it follows that a rectangle has two pairs of opposite sides of equal length; that is, a rectangle is a parallelogram. A squars either 25 m or 50 m long, but a backyard pool can be any size and shape desired. There are also very elaborate pools, with artificial waterfallTower Fall in Yellowstone National Park A waterfall is usually a geological formation resulting from water, often in the form of a stream flowing over an erosion-resistant rock formation that forms a sudden break in elevation. Waterfalls may also be artifs, fountainA fountain is an arrangement where water is forced into the air under pressure, creating a jet. The pressure may be gravitational, or may be produced by a motor-driven pump. A famous fountain rises from the surface of Lake Geneva. However, many fountainss, splash padA splash pad is an area for water play that has no standing water. This is said to eliminate the need for lifeguards or other supervision, as there is no risk of drowning. Typically there are ground nozzles that spray water upwards. There may also be othes, varying depths of water, bridges, and island bars; they may belong to a hotelHotel" is the letter H in the NATO phonetic alphabet See Hotel for the American television program that aired on ABC from 1983 until 1988. A hotel is an establishment that provides lodging on a short-term basis. Hotels often provide a number of additional or holiday resort.
Swimming pools designed for competitions are required to be a certain length and depth to guarantee that a 200 m race will always be 200 m long. Many public swimming pools are 50 m long and 25 m wide which is a requirement for Olympic and World Championship swimming. Professional pools require a minimum depth of 1 m and there are also regulations about other characteristics such as temperature, guttering and lighting as defined by FINA. Public pools are generally indoors — covered with a roof, and heated — to enable their use all year round. Competition pools have to be indoors to comply with the regulations regarding temperature, lighting and to protect the needed Automatic Officiating Equipment.
An ' Olympic Swimming Pool' is 50 m in length ("long-course"), 25 m wide, with 8 lanes of 2.5 m each. The water should be kept at between 25 and 28 °C and the lighting level at greater than 1500 lux. Recently "short-course" swimming events held in a 25 m pool have become popular (if not held at the Olympics). There also exist many pools 33⅓ m in length, so that 3 lengths = 100 m. This is sometimes jokingly referred to as "inter-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.
In the US pools measured in yards are still common. In the UK most pools are in metres, but older pools measured in yards still exist. In the US yards pools tend to be fractions of 100 yards (25 or 50), whereas UK non-metric pools are more likely to be based on 110 yards. However, the international standard is metres, and world records are only recognised when swum in 50 m pools.
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