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Trying to keep an airhole open in the pond
8 Mar 2003
It has been mighty cold here recently. My two air pumps driving airstones have been doing sterling service keeping a small hole open in the ice (and thereby preventing a buildup of noxious gases under the ice).
The bad news is that when it snows and/or gets very cold, then the hole is covered over, and then the air stops flowing, then the airline freezes, and then I have to take some action!
I decided to try an internet recommendation -- put a large flowerpot over the ice hole to protect it from snow and radiative cooling to the night sky. So far, my experience has been that one flowerpot worked so well that it enlarged the ice hole and fell into the water. The other flowerpot sank into the ice and then froze solid. So I can't call this experiment a 100% success.
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