I used to back flush the grey tank with a Flush King system and would be surprised by the "gunk" that was in the grey tank. I would do that every couple of months and drop the traps under the sinks to flush and clean them also.
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2013 Tiffin Allegro 34 QFA
2015 Cadillac SRX (towed)
2019 Tesla Model X
1991 Avanti Conv
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