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That's my only concern, which is why I was asking if anyone had tried it yet. The sump pumps are designed to work only when water is over them, if water recedes then the pump turns off. But in a pond it would always be covered. They seem to be less expensive than the typical pond pumps which I find I still have to replace every 1 1/2 years or so. If I have to replace it yearly, I would be ok with that. The benefit would be that the sump pumps are made to pump out sludge and mud without stopping up like the pond pump does. That's what I keep thinking about. If I give it a try, I'll be sure and post the results.