Thermo-Pond Floating De-Icer
Unique floating de-icer that keeps a hole in the pond free of ice, allowing toxic gases to escape all winter long.  Will not harm pond liner or plastic ponds.  Tested and approved for use down to 30 degrees BELOW 0 Fahrenheit.  Energy efficient. 
Item # AG8001   Thermo-Pond Floating De-Icer   $ 59.95 ea.