This solidly-built, 1250W, 7″ diameter de-icer keeps an area 7-8″ open and free from ice, so harmful gases can be safely released. Safe in all ponds – plastic, liner, or concrete. For use in ponds to 50 to 600 gallons. Industry standar 10′ supply cord. Fish and plant friendly. Safe in all ponds. Available in Denver & Salt Lake City warehouses. GW# 321015.