Water!
How often do you clean your water tank? We recently sold our hybrid which had a 15 gallon tank with a 4 gallon hot water tank. I would mix the cleaner (some combo my wife puts together with bleach a...
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We sanitize once a year in spring with the equivalent of 1/4 cup bleach per 15g water (50ppm) for minimum 4h contact time, drain then fill with either city water (treated) or well water with 2-3ppm chlorine added.
