Thanks Bee-dubya-ell you've about covered the details about the operation of a composting toilet. Yours sounds like the same model.

It's just that I thought people would WANT to do something in place of flushing and I thought a few turns of the handle might be a good idea.

Ebbie, I think you've solved it for me with kat's idea a close second. "serious deposit" "big deposit" "solid deposit" something like that.
I do like the mural idea as well. You can never have enough sailor and dance-hall girl pictures I always say.
Oh! Oh! Oh! When it's for sure the Queen is not around maybe I could have:

"If you give a shit turn the handle" Yes. Thanks, Charlie.
Cheers, Joy