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We use a lot of water for washing. I'd be dumping the same almost every day if that were the case. So as we only need to dump the black tank, all over five or six days. So I'll leave it closed for several days. Let the gray water back up. I'll leave it open for several days rather. And then when the black tank gets full, I'll close it and let it back up in the gray tank until the black water gets up to the belt.