Here in Central Illinois I still use a couple of gallons of RV antifreeze after our last trip of the year, "just in case". I pour 3/4 of it into the empty-as-can-be water tank and then run some through all the faucets. The little I have left I split between the two sink drains, shower drain and head. I try to do this at our last campsite then drive home with all low points open and all faucets left open. Five years in sub freezing temperatures with no problem so I look at the cost of the pink stuff as cheap insurance. - Camp2Canoe
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