richeyb, try using a Flush King to back flush the tank. I have used one since we started with our TT years ago. Works very well to flush black and gray tanks. It's on our "must have" list of accessories. https://www.amazon.com/Valterra-Degr...s%2C291&sr=8-3
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Robert & Diana McNeal
2019 Montana Legacy 3791RD 20th Anniversary Edition
2014 F350 4x4 6.7L SRW
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