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I back flush my black tank about 5 times. About the 5th time the water is very clean. I use a flush King to back flush my gray tanks. It is amazing what comes out of the shower water, lots of chunks of soap. I do the same thing for the galley tank. When I get ready to hit the road I use a little automatic dish washer soap in all of the tanks with about 3-4 gals of water and drive and when I get to my next stop I drain all of the tanks. You will be surprised what comes out of all of the tanks.
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