Which compound is used to neutralize chlorine residual in water systems?

The use of Sodium Thiosulfate to neutralize chlorine residual in water systems is well-established in water treatment practices. Sodium Thiosulfate acts as a reducing agent, effectively dechlorinating water by reacting with chlorine to form harmless byproducts. This makes it a valuable tool in situations where chlorine disinfection is applied, and there is a need to remove residual chlorine to prevent potential adverse effects on aquatic life or in the water distribution system.

Additionally, Sodium Thiosulfate is preferred because it is generally safe, stable, and effective at relatively low concentrations compared to other chemicals that might be used for the same purpose. Its effectiveness in neutralizing both free and combined chlorine makes it a go-to choice in water treatment facilities when dechlorination is necessary.

In contrast, while Sodium Bisulfite is another chemical that can reduce chlorine residuals, Sodium Thiosulfate is more commonly recognized for this specific application in many regulatory guidelines and treatment protocols. Potassium Chloride and Calcium Hypochlorite serve different roles in water treatment and do not effectively neutralize chlorine.