This publication is the second edition of the American Water Works Association (AWWA) Manual M20; the original manual was titled "Water Chlorination." This manual provides information on chlorination and chloramination practices for the disinfection of drinking water. It does not cover the use of chlorine as an oxidant or as a disinfectant for pipeline and appurtenances. Topics covered include: history of chlorination and chloramination; properties of chlorination chemicals; chlorination water chemistry and disinfection mechanisms; handling, storage, feed equipment of chlorine and ammonia systems; chlorine and ammonia safety; chlorine/chloramine disinfection strategies; dechlorination; CT values for inactivation of Giardia and viruses by free chlorine and other disinfectants; chlorine residual test methods, and disinfection (chlorination) of facilities.Need it now? Learn about AWWA's digital downloads.