Chloramine is toxic to cold-blooded animals, such as fish, because it passes through the gills of the fish or the skin of the reptile, and directly enters the bloodstream.
Fish tank and pond owners, including zoos, hobbyists, restaurants, fish markets, grocery stores with lobster tanks and bait shops with fish containers, must have appropriate filtration equipment or use water treatment products to neutralize chloramine.
Chloraminated water should be treated before it is added to your tank, aquarium, pond or goldfish bowl. Carbon filters on your tank may not remove chloramine from the tap water that is added directly to your tank.
Chloramine will not dissipate from boiling or holding water in open, standing containers. Chemical additives for dechloraminating water you add to your tank or pond (makeup water) are available at pet/fish supply stores.
Tap water used with artificial sea salts for makeup water in salt water fish tanks must be dechloraminated.
Carbon filters should be operated at a slow rate for best chloramine removal. They should be monitored carefully to determine when the carbon media has reached the end of its useful life and needs to be changed. Manufacturers often indicate the maximum number of gallons that can be filtered before renewal of the filters is required. Check with the supplier for proper operation. Testing the residual from the filter will help determine the best filtration rate.
Runoff from lawns or gardens should not be allowed to enter a pond because the possible presence of chloramines, fertilizers, insecticides, pesticides and/or any other material that may contaminate the pond.