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He had the air pump pulling outside air, had the pump under a cover out beside the pond. So yes pulling darn cold air.
Put a good thermometer on the bottom, watch the water temp as winter comes in. Mine stays right around 34f dead winter, in the 5 foot deep area. It is part of my davis weather station.
Put a good thermometer on the bottom, watch the water temp as winter comes in. Mine stays right around 34f dead winter, in the 5 foot deep area. It is part of my davis weather station.