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Which is Better for Water Disinfection, Sodium Hypochlorite or Gas Chlorine?

March 23, 2023
Chlorine has been used to disinfect water and wastewater in the U.S. since the early 1900s, and it remains the most frequently used water and wastewater disinfectant worldwide. Which is the most effective form of chlorine, liquid or gas?

The two most common chlorine products for sanitizing Water & Wastewater are   chlorine gas (Cl2) and sodium hypochlorite (NaOCl), and for the most part they function the same way, in that they dissolve in water to form free chlorine in the form of hypochlorous acid (HOCl) and hypochlorite ion (OCl−). Treatment plants target the same parts per million of free chlorine regardless of which chlorine source is used. So how do you choose?

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