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Never let any of the tanks get that full. Never travel with anything in the tanks. These tanks have a history of seam failure from over filling. As far as the black tank goes, its a waste of water to use the amount of water that a flush creates. For this reason, I installed a shut off valve in the water line to the toilet so I can either throttle it way down or shut it completely off. There is no need to flush a lot of water down every time. My wife and I can dry camp for 10 or so days without dumping.
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