I leave my gray valve shut because I want that water to rinse the hose out after dumping my black tank..
The dishwasher doesn't use that much water, and on my coach, 3 loads (normal wash day for the two of us) in the washer is about 1/4 of my gray tank.
We just check the gray tank level before starting the wash. If it's above 60%, I'll go ahead and flush both tanks, or if the black is almost empty, I'll bleed a little off the gray tank.
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Steve & Carrie
2019 London Aire 4576, Spartan K3, 605 Cummins
2022 Ranger Lariat Tremor Package
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