Contact a Customer Care Representative

We’ll get back to you within 24 hours or the following business day.

Find a distributor
Our extensive global network of distributors is ready to serve you in your local language at your time zone.

For Europe and Africa

Send us a message
Prefer to call? For product support, sales & general inquiries: +49-7025-9208-0

For Asia Pacific

Send us a message
Prefer to call? For product support, sales & general inquiries: +65-63 46 48 36

For the United Arab Emirates

Send us a message
Prefer to call? For product support, sales & general inquiries: +971 4 564 9109

Residual Sulfite

Sulfite occurs naturally in numerous minerals, and these dissolved minerals contribute to the mineral content of drinking water.

Sulfite can be found in most natural water sources and is one of the major dissolved components of rain. High concentrations of Sulfite in the water we drink can have a laxative effect when combined with calcium and magnesium, the two most common constituents of hardness. It can also cause water to have a bitter taste.

Sulfite is widely used for the dechlorination of wastewater in many treatment facilities. Dechlorination minimizes the effect of potentially toxic disinfection by-products by removing the free or total combined chlorine residual remaining after chlorination, which can prove toxic to fish in the receiving stream.

With residual chlorine discharge limits often very close to zero, monitoring residual values to comply with regulations has become very difficult and controlling residuals at values between zero and 10 or 20 parts-per-billion is often not achievable. To meet stringent discharge limits, the Sulfite or bisulfite used for dechlorination is added in slight excess, providing a small Sulfite residual to ensure complete dechlorination.