A swimming pool is any water-based body that allows people to swim or relax in it. It may be a large basin, a permanent feature in the landscape, or a temporary tank. In either case, it works in the same basic way: a combination of filtration and chemicals continually cleans and treats water that is in constant circulation.
The most common pool type is a recreational or public pool, which offers open access for swimmers of all ages and abilities. The pool may be built with a diving board or shallow area for non-swimmers, and it can be equipped with slides and other recreational features. The pool usually offers showers, changing rooms and lockers for storing clothing and other items before and after swimming. In addition, it usually has lifeguards to monitor the pool area for the safety of swimmers and to execute rescues when necessary.
Some pools are designed to be used for training or competition. These are generally 50-metre (164-foot) long and have a variety of facilities to improve the performance of swimmers, such as wave-killing gutters that reduce turbulence and racing lanes. They are typically indoors to enable their use year-round and allow for the installation of electronic systems for measuring and officiating swimming events.
Some pools have a natural or organic filtration system that uses plant life to filter the water. The flora in the “regeneration zone” absorbs phosphates and promotes the growth of healthy bacteria that eat algae and other unwanted organisms. A biofilter can be used in conjunction with an ozone, chlorine or other chemical sanitizer to make the water in the pool safer and healthier to swim in.
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