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every couple of months when on the road we dump calgon water softner and a cup of laundry soap into both gray and black tanks along with a about 5 gals of water .while moveing down the road this mixture cleans the tanks and sensors. you would be suprised what comes out of the tanks when you dump them, it looks like a tar mixture. we also use a holding tank treatment called piranha 1 oz per 10 gals mucher to use then most tank treatments
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