Another quick tip, before I forget … though I don’t know how I could. They say the sense of smell is the strongest trigger for recollection.
The biggest stink we ever smelled coming out of our RV holding tanks was not from the black water. Our kitchen grey water tank started expressing itself with a very pungent sulfur smell when we were staying at Lindenwood City Park back in Fargo, ND.
The lower campground had recently been re-opened after major flooding from the Red River, and a couple fellow campers said they wouldn’t be surprised if it was the water so we left it at that. When we dumped the tanks, however, we knew it had to be something more.
After putting two and two together, we realized we had more than just four times the worst stink we had ever smelled from even the toilet tank. A few days prior, we had rinsed a can of kidney beans and let all the water go down the kitchen drain. Well, unless you want a big surprise, I highly recommend you never do this.
After stewing for a few days in the hot holding tank, that bean juice fermented and gave off a sulfurous odor worse than any rotten egg. To avoid this from happening again we rinse our canned beans in a bowl and dump the water in our camp site’s fire pit. Just to be safe, we do the same with water from rinsing bowls used to scramble eggs and anything else we fear might cook up a big stink. We’ve also prepared ourselves with a bottle of RV grey water tank deodorizer but haven’t found the need yet and only plan to use it periodically.