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pdf. Visited on 13 July, 2015. Page 29. A guide to strengthening chlorination practices in small- to This is called. “secondary disinfection.” Chlorine can be added to water as a gas or in the form of hypochlorite either as liquid or solid. Gas chlorinationChlorine pro- vides good disinfection and is effective against a wide range of pathogens in drinking water. Recently, however, many water treatment plants have MODULE 5: DISINFECTION AND CHLORINATION. Bureau of Safe Drinking Water, Department of Environmental Protection. Wastewater Treatment Plant Operator Training. Chlorination is the most widely used method of disinfection of water supplies in developed and developing countries. Originally published by WELL, the.