The Farm Innovators Floating Pond De - Icer (P418) is an advanced thermostatically regulated all-season pond deicer. For ultimate safety and efficiency, this is specially made out of cast aluminum. The small hole releases harmful gases. The deicer is safe and perfect for your ponds of 50 to 600 gallons. The Farm Innovators Floating Pond Deicer will not disturb the beauty of your pond, its green color will surely add vibrancy to your fish sanctuary.