[QUOTE=MaxwellD;1078587]Well, I have been wrong before (once). I can see the membrane just below the shower strainer so I have a Hepa. Plunging did not help after all. Neither did Drano. I began bailing out the water with a Dixie cup but didn’t seem to be getting anywhere so I went to a trash can to bail with. Sure enough, water is coming in from the drain. Both grey tanks are open - nothing comes out the sewer line but flows back into shower. Now I wonder if the tank valves are operating - they were a two weeks ago! It is like the grey tanks are chocked full but wont empty. Ideas?[/QUOTE
Is your bathroom sink draining?
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