I use an old air pump and throw the air line to the bottom of the bucket held down by whatever to airate and mix. I use I/O salt too and have never had problems with white specks or percipitating. Since I only change 10% of the 90 gal of water I dont use a heater to heat it either. I just put the water in the sump and let the temp equal itself out there.
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MG
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