Originally Posted by thoer
I guess I am unclear on why a black tank needs to be kept so pristine inside considering what it gets again right away with the next use?
It doesn't need to be pristine, but if stuff builds up on the inside it won't drain properly, and anything that sits in there for a very long time seems like an odour control problem to me. There is also the level sensing issue, if you would rather read lights than point a flashlight into the open toilet.
Due to its size and shape, the black tank in my motorhome doesn't drain properly and requires occasional wand work... even more than the built-in flusher can do. My current trailer's black tank is like an Escape's, and seems to work better.