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Pour a couple of gallons of vinegar, cheep at big box stores, in the black and gray water tanks. It really lowers the freeze temps and is not hazardous. It will slush up though. As stated before, as long as your tanks are not full or nearly full, you do not have a problem. There is plenty of room for expansion. If your valve seals leak, get them fixed or replaced. Cheep booze will work, but vinegar is cheaper.
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