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Chlorination disinfection refers to a method of disinfecting drinking water with chlorine or chlorine preparations. The chlorine preparations mainly include liquid chlorine, bleaching powder, bleaching powder essence, and organic chlorine preparations. Natural water contains various microorganisms due to the pollution of domestic sewage and industrial wastewater, including bacterial pathogenic microorganisms and viral pathogenic microorganisms that can cause disease. The purpose of disinfection is to kill various pathogenic microorganisms, prevent the spread of water-induced diseases, and protect people's health. Disinfection is an indispensable step in the treatment of drinking water, and it guarantees the bacteriology of drinking water.