1kg Ascorbic Acid Powder Koi

One gram of ascorbic acid will neutralize 1 milligram per liter of chlorine per 100 gallons of water. The reaction is very fast. The chemical reaction (Tikkanen and others 2001) of ascorbic acid with chlorine is shown below:

C₅H₅O₅CH₂OH + HOCL → C₅H₃O₅CH₂OH + HCl + H₂O

Ascorbic acid + Hypochlorous acid → Dehydroascorbic acid + Hydrochloric acid + water

Directions:

Approximately 2.5 parts of ascorbic acid are required for neutralizing 1 part chlorine. Since ascorbic acid is weakly acidic, the pH of the treated water may decrease slightly in low alkaline waters.

Vitamin C effectively neutralizes chlorine and is safer to handle than sulfur-based dechlorination chemicals.