Crystal clear dechlorinator dry is basically sodium thiosulfate which is widely used to break down chlorine and chloramines and is considered non toxic to fish.

Winston Crystal Clear CC013-8 8 Oz Dry Dechlorinator: Dechlorinator Crystal clear dechlorinator dry is basically sodium thiosulfate which is widely used to break down chlorine and chloramines and is considered non toxic to fish Sodium thiosulfate was chosen because it seemed to be the perfect product or solution for use in water gardens and ponds because of its ability to break the chlorine bond and chemically remove the chlorine after a short working time 8 oz bottle that treats 45,000 gallons this product is extremely potent and directions should be followed closely It is best used for regular water changes and when filling a new pond Phosphate and nitrate free Safe for fish and plants and has a shelf life of 1 year 8 oz