[DutchmenSport]

Actually, my kitchen sink holding tank smells worse than the black tank. I have the ability to dump my grey tanks on the ground at home, and my black tank always goes to my septic tank. But when dumping the kitchen sink, it smells horrible.... I mean horrible.

I started using an Enzyme eater in all my tanks, add some after every dump. It takes only an ounce. And amazing, my kitchen sink tank doesn't smell near as bad as it use to. It still has a bad smell, but NOTHING like it use to.


In all the years we've had an RV and working with the tanks, by far the kitchen tank smelled the worst. So, yes, it's highly possible the problem is really one of your grey tanks.

Add some enzyme eaters and let it do it's work. Just add an ounce after every dump. See if that makes any difference over time.

You don't want a deodorizer, get something that actually eats the bacteria.