It's called heat pipe theory. You sink a pipe below frost line where gound temperatures are stable and the water will thermosphion with-in the heat pipe keeping the surface free of ice.
Another method is covering one end of the troff with a clear hard plastic then vertical down to just off the bottom. Seal the top edges of the plastic to the tank edge. The sun will solar heat the water and thermosphion the water thru out the tank. Draw back here is it's very easy to over heat the water during the summer time.
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Today's Featured Article - George's Fordson Major - by Anthony West (UK). This is a bit of a technical info to add on to the article about George's Major in the "A Towny Goes Plowing" article. George bought his Major from a an implement sale about 18 years ago for £200.00. There is no known history regarding its origins or what service it had done, but the following work was undertaken by Harold alone to bring it up to show standard. From the engine number, it was found that the major was produced late 19
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