Farm Innovators Floating Pond De-Icer Is Indestructible, Safe, & Energy Efficient. Designed to keep a small hole open to release harmful gases produced by fish waste, & decaying plant matter. Ponds should never be allowed to completely freeze over during the winter months. The floating Pond De-Icer is thermostatically controlled to operate when necessary in sub-zero conditions. Safe for all ponds, fish & plants. Cast aluminum, 1250 Watts, ideal for 50-600 Gallon ponds.