Well, I did what I had to do with an on the road repair. [emoji1695] It turned out not to be blocked but a bit clogged. I never had a backup, just a slowdown. I got the “stuff” moved and all has been well.
I did develop a new technique. About an hour before draining the black tank I use the ice cube trick, but not to clean things off the sensors. I dump all the ice from the ice maker in the toilet and get it down below. Then (with toilet valve closed) I pour a gallon of water into the bowl, then flush. The weight of the water dropping in and pushing chunks of ice moves anything remaining in the crossing pipe and into the main tank. After an hour the cubes have melted and I drain the tanks as normal.
We are also more aware of using plenty o’ water when using the toilet for certain ops. [emoji6]
I had no problems after that incident. Oh, I got rid of the “sacrificial PEX”. [emoji16]
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