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Disinfection using DPD
Chlorine is used as a primary disinfectant because of its effectiveness in killing potentially harmful organisms. It forms hypochlorous acid in pool water whose effectiveness at disinfecting is influenced by the other chemicals that are in the pool - primarily pH and the amount of waste present.
- Hypochlorous acid that has not reacted with bather waste is “free chlorine” and must be carefully monitored in order to guarantee a safe pool.
- Hypochlorous acid that reacts with bather waste forms “combined chlorine” which reduces its power to disinfect and is also associated with the unpleasant smell and irritation of eyes and nose that can occur in pools. 'Combined chlorine' results from the reaction between ammonia-based compounds from bather waste and chlorine to form monochloramine, then dichloramine.