A friend told me that every time he moves he puts half a bottle of bleach in the black tank and then 1/4 in each of the two grey tanks. ($1 from Dollar Tree)
We don't go that far but if ever we smell anything we dump some bleach in with the tank half to 3/4 full and by the time we get to the next campground smell has gone. We back-flush the grey into the black also most times we dump which helps keep the tank clean and then at the end of the season we will run the last couple of hundred miles with Extreme Clean in all tanks before final flush for the winter.
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