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Unlike tap water distribution systems, pool water is recirculated every six to eight hours. During this time, swimmers’ activities can introduce a broad range of organic pollutants that can react with disinfectants.
When chlorine reacts with these precursors, a variety of chemical reactions take place, including the formation of disinfection byproducts (DBPs). Chlorinated DBPs can promote respiratory ailments. Standard pool filtration systems are ineffective at removing the precursors.