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The three most common chlorine-containing substances used in water treatment are chlorine gas, sodium hypochlorite, and calcium hypochlorite.
Chlorine is observed to. be the most popular disinfectant followed by chloramines. These disinfectants are relatively. strong oxidizers and, even at the relatively low levels used in potable water treatment, have. been reported to impact the long-term performance of materials used in potable water (3, 4).