Pond De-icers or Pool Heaters. In areas where the threat of ice in winter is obvious, the necessity of a pool heater or deicer is recommended. The aquatic life in your pond, especially the fish, cannot survive heavy ice buildup and noxious gases may be trapped. The use of the pond de-icer will, by a thermostat that turns on when in need at lower temperatures, keep a hole in the ice to allow the noxious gases to escape. Do not forget to consider the use of a GFCI when purchasing. If in doubt, please call to discuss this safety usage. Purchase with the TRICKER GUARANTEE and confidence on the Internet!