Swimming pools

Swimming pools - installations used for mass swimming, sports activities, or medical procedures (sanatoriums).
Summer swimming pools usually open, arranged in natural water bodies (rivers, lakes, the sea). In the flowing waters they are above sources of pollution, or not less than 2 km below them. There are artificial outdoor swimming pools with concrete tubs filled with water from the water. Such bpts often equipped with installations for cleaning and heating of water (it allows to widely use open B. p. in winter). Closed bpts are capital constructions with special sanitary equipment, with stands around tubs and a number of utility rooms (cabins for changing clothes, showers, restrooms, and other). Length baths bpts - 25 or 50 m, depth - 1 - 1.2 m with gradual increase up to 1,5-1,7 m, and in places for jumping - not less than 3.5 to 4.5 M. the water Temperature in winter in the indoor swimming pools 22-24 degrees (for children and beginners to swim - not below 24 degrees), and in open 27-28 degrees.
In swimming pools is usually applied recirculation system with three-time circulation of water per day and the addition of fresh water only 5-10% of the volume. Disinfection of water produced by chlorination and ultraviolet radiation pretreatment at sand filters.
The amount of residual chlorine in the water should be not less than 0.2 mg/l; total number of bacteria - are not higher than 100 in 1 ml once a month in the water shed and the bath purified. The content of residual chlorine in the water define every 2 hours. Bacterial pollution of water (coli-index) is checked twice a day, sanitary-chemical analysis doing 1-2 times a week.
To prevent water pollution, before entering into the bath pool, swimmers wash the body with soap under a warm shower.
Continuous monitoring of sanitary-hygienic conditions bpts leads doctor pool, control is carried out by the local authorities.