Water Treatment

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Water Treatment

Sodium Thiosulfate:

Sodium thiosulfate is the strongest water dechlorinater on the market today. It is used mainly for film developing, candle and soap crafts, treating water in salt and freshwater aquariums, ponds and removing bleach from aquarium decorations. It dissolves fast in warm water. This product is safe for all fish, invertebrates, and corals.

Chlorine is known to react with organic matter in the water to form trihalomethanes (THMs), a suspected carcinogen. Using Sodium Thiosulphate you can create a home-made mixture to remove chlorine from your pond water.


Make a solution consisting of 4 ounces (1/4 lb) Sodium Thiosulfate crystals (photo or technical grade) dissolved in 1 gallon of distilled or deionized water. Use 5 ml (1 teaspoon) of the solution for each 10 gallons of makeup water to neutralize up to 3.75 ppm chlorine. One cup can be used for each 500 gallons. (The entire one gallon of solution will treat about 7500 gallons of tap water.) The shelf life of the solution is about six months when stored in a cool location. The crystals will keep for several years if kept dry.

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