The issue may be a poo dam. The toilet in the 29FE sits on the opposite side from the deep end of the black tank. Same as our ACE 27.2. (The boys that designed these MH's must never use one.) The black tanks on these rigs have a slope down to a deeper portion of the tank. The toilet pipe drops onto the sloping dry section of the tank. If the user does not put a fair amount of water down the toilet prior to dropping bombs and paper into the tank the waste drops on the dry portion of the black tank. This can develop a poo dam.
We bought a used rig and experienced the issue first hand on our first trip. Prior users had dammed up the toilet. I had to bring a cut off garden hose into the RV and ram out the piping through the toilet and the "poo dam" in the black tank from inside the coach. Afterward I filled the tank full of water and a qt of Dawn & Calgon to soften anymore poo. Let that sit for 24 hours before I tackled the crappy job again.
After this lovely start to ownership of this new rig I learned from the boyz on this site to pre flush the toilet with a bowl full of water with dish soap, then fill bowl do your business & flush. Then run a third bowl with dish soap as a finsher. I have had no further issues with the black tank since following these procedures. it is not a problem flushing like this on a full hook up but it uses a ton of water when boon docking.
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2018 ACE 27.2
Toad 2019 Jeep Cherokee Trailhawk
Roadmaster Falcon All Terrain Towbar
Roadmaster Invisibrake
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