A swimming pool is a body of water designed for recreational swimming or other aquatic sports and activities. Swimming pools can be indoors or outdoors, inground or above ground, of any size and shape, and built from concrete, fiberglass, vinyl-liner or other materials. Some are built as permanent fixtures in the landscape, while others are part of a building or complex, often called a natatorium.
Whether to build a swimming pool requires careful consideration of available space, the amount of time and money the owner is willing to devote to maintaining the pool and other lifestyle options. There are also significant ongoing costs associated with opening and closing the pool, cleaning, checking connections and sanitizing the water. These include electricity, chemicals and supplies, adjusting pH levels, adding algaecide and surface repair, including liner replacements. Choosing cost-saving green alternatives to chlorine as the primary sanitizer can significantly reduce these expenses.
For competitions, the International Swimming Federation (FINA) regulates pool dimensions, lighting, and other standards to ensure fair competition. For example, Olympic swimming events are swum in 50 m pools, while USA Swimming rules specify 25-yard pools.
Some swimming pools are used for specialized activities such as water-ditching training for aircraft crews, or by astronauts. Other uses for a pool include recreational swimming and water therapy.
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