The statement is true.
Sodium hypochlorite (NaOCl) is a compound that can be used for water purification in the water purification plant. It is used on a large scale for surface purification, bleaching, odor removal and water disinfection purposes. Hypochlorites are used for sewage and waste water disinfection as the most extensively used chlorine compounds.
So we can conclude that the answer is true.
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