Black water tank flush

The water is still going in, it just doesn't sound like it is "rotating"
The only real advantage to having it functional was that the tank
monitor seemed to work fine after an occasional "spritzing"

Same thing happened to us on a previous trailer. I think the "spinny jet thingy" on the end either jammed or blew off.

I just ignored it and went on using it....It did squirt water into the tank and "stuff" did dump out like before it broke.
I am not overly needy of a spotlessly clean black tank anyway.

I was told the only fix for it was a new one. Too much trouble to access the tank and replace.

There is usually a check/anti-siphon valve just inside the inlet that may be bad. Is water going in at all?