I have the same unit as yours, and have washer/dryer, and have never had the problem you discribe. However my guage always reads 1/3 full on the gray tank. When we are travelling I try to have the gray tank 1/4 tank full and then let it slosh around going down the road. I think this helps clean out stuff in the tank.
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06 MS 36TK3 #2473 w/(Phase II)side to side levelers, Trailair pin box w/Tri-Glide plate.
2011 Dodge 3500 CC 4x4 Diesel DRW Power Tuner guages etc
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