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You want to leave the by-pass on until all traces of RV anti-freeze have been flushed out of your system and the lines are sanitized. Then reverse the by -pass valves and fill the tank.
Flush the H/W tank with fresh water only.
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99DSDP 3884, Freightliner, XC, CAT 3126B, 300 HP /ALLISON 3060
2000 Caravan toad, Remco & Blue Ox.
Thor Owners Club Nor'easters Club Mid Atlantic Campers Ford Super Duty Owner
Join Date: Jan 2010
Posts: 2,098
I can't speak for others but I try to expose all of the internal plumbing including the HW tank, low point drains, all the lengths of the fill hoses I carry and the fresh water tank drain to the bleach mixture I use to sanitize the system. I start out by addin a cup of bleach to all my linked together hoses then fill them with water and let them sit. Then I connect it to my tank fill and fill the entire system while bleeding all of the anti freeze and air out from every point until I can smell the bleach. Then it sits for a few hours. Then comes the flushing which can take the rest of the day since I have a washing machine and ice maker. I'll fill and pump about 4 tanks of fresh water through every line in the system
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