Quote:
Originally Posted by Chief Brown
When I flush my black tank in my 2021 Montana H/C I will dump tank first.
Then I close the valve and flush for 2 minutes, then I dump that. Then I close it off again and flush for 3 minutes and then dump again. I will repeat again for 4 minutes. Am I wasting water because my black tank sensors still do not work? The sensor shows full all the time.
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I run the flush for 15 minutes when dumping on a mechanical water timer, then 15 minutes with valve closed to partially fill tanks, pull valve and put another 15 minutes on the flusher. Repeat as many times as needed to get as clean as you want. Naturally I have a 45 degree clear elbow attached to the second shut off valve to judge when clean enough. Why 2nd, so if that one fails, I can reach behind it and shut the next valve in line. With black water I want 3 valves between the crap and the outside world. I also start a 15 min timer on my watch or phone as backup to the mechanical timer. After black is done I then do a similar dump, fill, dump with the grey followed by the galley.