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.
My shower has a trap but I can tell you, gray can often be as bad if not worse smelling than black. No smell ever from my shower. I would think modern RV's would have to build traps into any gray water drain. Not sure I have ever seen a straight pipe into a gray tank. Maybe older models? yuk.