Last year I removed both the pumps from my pond and cleaned them really good with fresh water. After I cleaned them I soaked them with food grade silicone spray so it would be safe for the fish when I put them back in the pond come spring time. I doused every part of the pump I could. The rubber bushings and sprayed directly inside the impellers. Then I stored them in my warm attached to the house garage where even if there was residual water inside the pump somewhere it wouldn't freeze. This year Im wondering if I should just leave them in the bottom of the pond (about 3-3.5ft deep). It isn't out of laziness because when it comes to my pond maintenance Im sure not lazy. I just wanted to get some takes on what everybody else thinks....by the way the pumps Im referring to are the pump that controlls my waterfall (biofalls) and the pump that goes to my filter. I will be using 2 other pumps that control the airstones throughout the winter. Im still up in the air on using external pumps for that or using the Little Giant submersible pumps. Thats another discussion actually already in another thread
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