It does sound like a great idea Jakeboxer.I think doddblder2 brings up a interesting point. If there is a foot of water frozen on top of a smaller pond in the winter and flow is introduced at a fairly steady rate from the bottom, what is the affect? Could a relief system be incorporated? could a second pipe be added ( a split in the line) that could be switched during the winter months to the top? I believe any time you can get some movment under your pond is a win-win situation.I have city water here and could'nt use a well if I had one.The water is too hard and would gum up the works.What brand do you have Don? doddbldr2 mentioned the antifreeze loosing its punch over time, have you noticed this in the two years since having yours installed?...GO USA!!........

Ted Kennedys car killed more people than my gun ever did.