Forum Discussion
msmith1199
Jun 29, 2016Explorer II
Sounds like your air vent is clogged. There is a pipe that runs from the black tank to the roof.  You shouldn't get that bubble unless that pipe is clogged.  I had it on my National RV so I started using the stuff from Camping World to help break down waste in the tank.  You probably have a large pile of hardened stuff in the tank too.
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