I've never had to do it as I put a hose and valves from Home Depot for a winterizing kit. But if I did sanitize my tank, I'd use the same no rinse sanitizer that I use for my home winemaking. Only takes a tsp per gallon of water. Disolve it hot water in a container and then add to tank. But I would rinse it a bit after I drained the sanitizer out. I'd even run it through the lines as well and reall don't see why I wouldn't do the same with the water heater, just drain it really well.
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2011 Springdale 296BHSSR
2003 Dodge Ram Quad 4x4 4.7L
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