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Dewinterizing is fairly straightforward process: Fill the water tank a little, setup the winterizing valves for summer, make sure water heater has the plug in, pump water through each faucet until pink stuff is gone.
After that if you wish to sanitize the system then you put a cup or two of bleach in the fresh water tank and fill it up, run water through each faucet until you smell the bleach, let it sit for a few hours (longer is better) then drain the tank, fill with fresh and repeat "every faucet" until you no longer smell bleach.
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