I use an alternate grey hose exclusively for my sewer duties, and never use my white hose for such.
The all in one manifold in the convenience center is a neat idea, but, even though it has anti-siphon fittings, I would never trust it enough to have it all hooked in so close to my fresh water supply. Not worth the health risks, in my opinion. When I do sewer duty, the fresh water supply is always disconnected, and plenty of water is run through the pedestal faucet before I ever hook up the fresh hose again.
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