However, it must contain high quality granular activated carbon and you must permit sufficient contact time. Salts can be caught by the permeable membranes but chloramines pass through easily. Boiling is not an effective method of removing chloramines from water. The only practical methods for removing chloramines from water are using a water conditioner which contains a dechlorination chemical or by using granular activated carbon. Ask your pet supplier or read the instructions on the container or equipment.
Ammonia can be toxic to fish, although all fish produce some ammonia as a natural byproduct.
Ammonia is also released when chloramines are chemically removed. Although ammonia levels may be tolerable in individual tanks or ponds, commercial products are available at pet supply stores to remove excess ammonia. Also, biological filters, natural zeolites and pH control methods are effective in reducing the toxic effects of ammonia. Mosquito control agencies sometimes use fish to eat mosquito larvae. They would be affected if the water in the channels or ponds is chloraminated.