The Aquascape 300-Watt Pond De-Icer is ideal for preserving a small hole in the ice during freezing winter months and ensures proper gas exchange, which helps keep fish safe until spring. Operated by an internal thermostat, the de-icer warms only the water immediately around it to prevent ice from forming. The stainless-steel construction prevents corrosion and cracking, providing years of trouble-free operation.