Back flushing black tank

[frederick]

Hi

Using a back flush unit, is it possible to back flush so much water that the
black tank water over flows out the toilet?

I guess I could watch the guages (if they're correct) and or have someone
peek down the toilet while I'm doing this. A better way?

PS: I'm new at this. The other froums have my name all over them.
Thanks a million to everyone for being patience and informative.

Fred Rubio from Pasco, WA. a friend of Bill W.

 

[Grandview Trailer Sa]

Re: Back flushing black tank

Yes, you can overfill and yes the water is going somewhere. When I do it, I watch my gauges and dont let anyone interrupt me. :laugh: :laugh: