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What I have done for many years and several different campers is to simply put 3-4 gal of antifreeze in the fresh tank and pump it through all fixtures until you see pink come out. Don't forget the outside shower and washer if you have one. Drain water heater and bypass first.
In the spring you simply fill and drain the tank several times/run all fixtures flushing the lines out, adding a little bleach the last time. Let that sit for several hours then flush everything several more times and you should be go to go for the season.
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