With a strong powerhead in the bottom of the pail, I would only fill the pail to say half full and then place a heater in. If you want more just use another pail. I would change the water every two weeks, as it's best to let the rock cure for 3-4 weeks. You also need to keep the pails free of lids as you want fresh air to also circulate over the rock. You could keep the pail in a garage or garden shed.
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