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before several fillings of the gray tank and at least in the RVs that I've owned. I haven't had the luxury of large enough gray tanks to have to worry about filling the black tank. I'm sorry, I can only eat so much. So even when I'm traveling with others, there's way, way less chance of filling a black tank for the amount of time that we're staying at any location. I mean, I'd have to be a month literally at one location before I'd be in danger of filling my black tank. But in that same period of time, probably five times, I'd need to empty the gray tank. So that's just the way of things. There you go.