I add bleach to my water tank if I am not going to use the RV for a while and run a half tank of water with a cup of bleach thru the faucets, shower and hot water heater. Before I leave on a trip, I empty the tank, fill it with fresh water, run the fresh water thru the hot water heater, faucets and shower, empty the tank and and half fill it to travel. I have never had any foaming problem.
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