I have a large pick ax to break up the ice. It gradually ices up from the bottom and sides, the open area getting smaller and smaller. I missed breaking it up for about 24 hours, and it froze too solid to break up. It's warm enough today that I might get it cleaned out and start over. I may have to resort to a heater, but there's no outlet anywhere near there. I've seen some nice solar-heated waterers, but they are pricey.
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