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I fill my black tank 3/4 full once or twice after the final dumping of a trip. I use a digital water gauge to know how much water is going in. I use a clear fitting so I can when the water is clear and free from debris for the most part.
I then add 5 gallons of water to the black tank and add Calgon Water Softener and Dish Soap. The water softener keeps the inside very slippery so debris doesn't want to stick to the walls and sensors causing false readings.
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