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Chemical removal of nitrite and chlorinating agents from municipal water supplies used for crayfish and aquarium finfish culture
McRae T 
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Abstract
The presence of nitrite ion and chlorinating agents in municipal water supplies can be a problem for use in experimental crayfish culture because of its toxicity. Chlorinating agents can be reduced easily with sodium thiosulphate. Although nitrite can be eliminated by biofiltration, there are occasions where it is necessary to maintain laboratory aquarium water quality by direct water changes. This paper presents a simple, but effective method of conditioning the municipal water so that it is not toxic to aquarium species - including crayfish. The basis of the method is oxidation of the nitrite to nitrate with sodium hypochlorite and subsequent reduction of excess hypochlorite (and other chlorinating agents) with thiosulphate.
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McRae T. (1999). Chemical removal of nitrite and chlorinating agents from municipal water supplies used for crayfish and aquarium finfish culture. Freshwater Crayfish 12(1):727-732. doi:
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