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When parked for longer periods we wait til it burps which can take two weeks or more for us. I prefer to travel with tanks empty. Occasionally I flush the black tank by dumping, filling the tank up via hose thru the toilet and then dumping again. I have always understood that tank should be at least half full before dumping.
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Mike and Lorraine
2002 3655 FL, 2005 3650RK
2010 3665RE, 2015 3910FB
F350 crew cab dually 6.7
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