Ice moving / crushing a float system could be a problem. The pond we're having winter kill issues with is small and secluded, so it might not be much of an issue there. In a larger BOW, it might be. Maybe I can build a couple of float systems and put one in our larger pond (7 acreas, fairly windy for western PA) without an aerator / solar system, to see how it rides out the ice. I'm thinking 55 gallon plastic barrels with some water in them for floats with a wood frame.
The "cold" aluminum condensate trap idea is a form of refrigerated dryer, although maybe not very efficient. Dessicant dryers need some air pressure to work and bleed-off a good bit of air during regeneration, but would be workable if power was available. With solar / wind, it might be too large a power penalty. Good ideas.
