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Message: [QUOTE="waynefrcan, post: 149179, member: 4621"] What??? After 225 posts in this thread, the best minds in Can, US, UK have come up with this method for very cold winter climates. Go with airstones at 1 ft level and a heater to keep small hole open. I have a bottom heater as well to keep the bottom temp above 35F. It's probably not needed but I'm doing it. So what if cold air is pumped in. Here in Canada the pond temp top and bottom stays 32.5F anyway. There is no pond stratification as in the warmer climates. If you go surface heater you will need a surface pump for aeration. [/QUOTE]