Chloramines, also known as combined chlorine, are made up of monochloramine (NH2Cl), dichloramine (NHCL2) and nitrogen trichloride (NCl3). These compounds are formed when free chlorine (hypochlorous acid) reacts with nitrogen that swimmers introduce into the pool which then break down into ammonium compounds. Chloramines are relatively ineffective sanitizers, and nitrogen trichloride in particular is responsible for the nasty chlorine smell associated poorly maintained public pools. To break down chloramines, the level of free chlorine must be raised.

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