When my tank reading lights were showing wrong levels I would use the Flush King unit to back flush the tanks. I also would open up the basement side panels to expose the plumbing cleanout cap. Removed that cap and used my made up wand to put water pressure into that opening. I would force out the gray water holding tank "stuff" that was clinging to the sides of the tank. Tank readings worked again. About once every couple months or so I would do this where the park had terrific water pressure, made the job easier and faster.
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2013 Tiffin Allegro 34 QFA
2015 Cadillac SRX (towed)
2019 Tesla Model X
1991 Avanti Conv
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