hmmmmmm! Maybe that's why our 5ers black tank is so slow draining and has been since the very first time. Unfortunately, the pipe from toilet to tank has a 30-45* angle so would have a problem snaring anything there or even getting a an endoscope type camera in there - I've tried. I just do a strong back flush which seems to work - and even got the sensors working right yesterday after a mega flush.
Good job getting that out
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