Frequent Questions

What is the most common form of chlorine used to disinfect drinking water at drinking water treatment plants?

The most common form of chlorine used to disinfect drinking water is chlorine gas. Sodium hypochlorite, an aqueous solution often referred to as liquid bleach, and calcium hypochlorite, a solid crystal, are other common forms used for drinking water disinfection. (Occurrence Assessments for the Final Stage 2 Disinfectants and Disinfection Byproducts Rule, EPA815-R-05-011)
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