Holding Black Water or Flowing Through

or ask about what to tow a 5er with both size and brand

Now ask about driving with the refer on propane.

Never leave your black valve open; you'll end up with a poop pyramid. Wait till nearly full, then dump.

Not only smell, but when you leave the blank tank open, the liquids drain out and the solids generally don't. And when the solids stay behind, you may have a major chore getting that "poop mountain" to go away.

Keep the black tank closed until it's at least 3/4 full before you dump. Whether you leave the gray tank open or closed is optional, and you'll get advocates for either. On our rig, the black tank sensors tend to foul, but the gray tank sensors work fine. So when the grey tank shows full, we know the black tank is also probably ready for a dump.

And if you use the park showers rather than your own, that wouldn't work very well for you.

al

I usually treat the black water tank and occasionally dump it followed by dumping the grey water tank/s to "clean" the sewer hose a little.
If you keep the black water tank "open" to the dump you might get the smell coming all the way up...