I have seen this done before too but I don't want any part or chance of black water mixing with my fresh water so I think I'll just keep hooking up the second hose when needed. Maybe I'm crazy but getting sick isn't a good thing and I try hard to stay healthy. I would not live with myself if the grand kids or the dear wife came up sick and this was the reason for it . Just my 2 cents worth . Many happy camping trips to all take care.
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