I sanitize my fresh water tank in the spring when I de-winterize the MH, then I put about a quarter to a third of a tank into it. If we are going to have hookups we just leave the water in the tank and use it for water on the road, replacing the water as required.
If we are not going to have hookups I fill the tank. When we are going to have hookups again I drain it down to a quarter full.
I repeat the whole thing again the next year. Never had a problem.
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