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I wasn't able to have my pond breathers running for last winter, so I tried aggressive aeration instead.I bought a 120 air pump to insure enough surface agitation to keep an opening for gas exchange. is this wrong ?
What wound up happening is that the aeration and resulting evaporation removed so much heat from my 5' deep pond that the ice cover was more than 3 feet thick, instead of the usual 2 feet.
I live on the extreme of what's practical for winter pond keeping, so in a milder climate it's probably fine, but just something to keep in mind when setting up a pond for winter.