I'm forever indebted to the RV repair folks at Freedom RV in Tucson, for turning me on to the black tank additive, "Tank Tech Rx." It's a biological solution to keeping your black tank from stinking. What it is, is a culture of crap-digesting bacteria that turns your black tank into a kind of liquid compost (but I don't think it's composted enough to garden with.) You put about an ounce of the stuff down there and it digests the waste. When you dump your tank, there is very little odor, no need to rinse your tank. It makes things much more pleasant. No chemicals, no artificial smell. The only down side is the cost: about $25 for a quart. But since you only need one oz per treatment, depending on the size of your tank and how often you dump it, a quart can last you several months.
The most important thing to make your dumping experience as pleasant as possible is to add sufficient water along with your deposits. I literally ruined the black tank on my first RV by being too stingy with water, wanting to stretch the time between dumps. Nowadays I often pee outside, saving black tank space, but I put half a gallon of water down with each poo. It totally helps, along with the Tank Tech Rx, to keep my tank healthy and working and, very important, not stinking.
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