Doofus - I end up doing it about twice per winter here in NC. Just did it last week as we have freezing temps apporaching the next few days. I also know I won't get out in December. We'll get a weekend out in January and/or Feb as well, so that means one or two more times. It takes me exactly one gallon to get the pink stuff flowing through every faucet and the toilet and have enough left over to pour down each drain.
To me it's very little effort and we enjoy getting out in the winter when the campgrounds are empty and a roaring fire goes great with a hot chocolate (and a bit of 80 proof flavoring!
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