We have tried everything from an impeller mounted through the bottom of the laundry tub to a vertical shaft through the glass cover driven by a small motor, and there is no doubt that by far the best method uses a submersible circulating pump such as used in an aquarium. Submerge the pump below the surface so that no air can enter it. Aerating the water is important for the well-being of fish but in fermenting it would simply make the yeast grow at an alarming rate. Fermentation is an anaerobic reaction which requires the absence of air if it is to produce alcohol.
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