As all fish keepers know it is necessary to remove chlorine and other impurities from tap water when introducing it to a pond or aquarium. Failure to do this can result in fish health problems and also adversely effects the growth of beneficial bacteria in all filters. The most common method of de-chlorination is to add chemical treatments to break down the chlorine.

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Chlorine and chloramine are used to disinfect tap water. The average value is between 0.5 and 2mg/l. Sometime, the chlorine content of tap water can be dangerously elevated out of fear for water contamination. Usually the chlorin values in tap water are highest during summer. Although relatively harmless for human beings, carps are very sensitive to heightened chlorine content.

Doses of more than 10mh/l are lethal, the fish will die within a few hours due to gill and skin burn. The toxicity of chlorine increases with high temperature, low PH, low oxygen content and strong water pollution.

Filling a pond without the use of a dechlorinator can be dangerous, although rare situations have occurred where the chlorine content in tap water is lethal to fish.