AllegroD wrote:
For those with a straight pipe in the shower/tub, if matter backs up into the grey, this could cause other problems like smell in the bathroom. I'd want to be sure I had a trap in the shower/tub and a rinse in the gray tank before combining.
If there's an RV out there with a straight pipe from the shower into the grey tank, they've already gotten used to the awful smell. Grey tanks can smell as bad as, or worse than the black tank, as Effy said. I've never seen a factory RV without traps on the shower and sinks.