Dechlorination: Sodium Metabisulfite is used in water treatment plants for dechlorination purposes. It effectively removes excess chlorine residual from water after disinfection processes, ensuring that the treated water meets regulatory standards and is safe for consumption.

Oxygen Scavenging: In boiler feedwater treatment, Sodium Metabisulfite is used as an oxygen scavenger to prevent corrosion and scale formation. It reacts with dissolved oxygen in water, reducing its concentration and minimizing the risk of oxygen-induced damage to boiler components.

Reducing Agent: Sodium Metabisulfite serves as a reducing agent in water treatment processes. It can effectively neutralize oxidizing agents and remove heavy metals such as chromium and mercury from wastewater streams, aiding in metal precipitation and removal.

Antioxidant and Preservative: In certain water treatment applications, Sodium Metabisulfite is used as an antioxidant and preservative. It helps inhibit microbial growth, prevent oxidation of organic compounds, and extend the shelf life of treated water during storage and distribution.