Farm Innovators Floating Pond De-Icer is useful during winters. It helps keep the water in pond from completely freezing. Made of premium cast aluminum, it lasts long and is safe to use in all ponds up to 600 gallons. The pond de-icer has a heater which operates automatically with its thermostatic control. It keeps a hole open in the ice to release gases caused by fish waste and plant decay. The Farm Innovators de-icer comes with a durable plastic cover over Styrofoam which allows de-icer to float on the surface of water.