This is interesting to see. We have a 2010 Mobile Suites with a toilet that dumps directly down into the black tank with a push of the pedal. We are going as much as 7 to 9 days before dumping. My process is to dump the black and then flush for 5 minutes, followed by closing and opening the black tank valve after 2 1/2 minutes each. Always have clear water after 5 minutes of flushing, and on reopening the black valve, we will have clear water after about 2 seconds.
I wonder if there is some kind of issue with your toilet system?
Terry
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Terry and Jo
2010 Mobile Suites 38TKSB3 #5332 - 2008 Ford F450
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