Merry Christmas Everyone.
I thought I would share my experience with sewage odor in our coach. There have been several posts about this problem and I would share our lessons learned.
We are on our second month of our first trip south for the winter. The first two weeks we were at a site that did not have sewer connection and we had no problems (except for our flatulent dog
). But as we arrived at a full hook-up site we started returning to a very stinky coach. It was warm so we were kepting the fans on. It was strange because it wasn't coming from the bathroom but around the sink.
After reading uncountable posts on the problem I zeroed in on the AAV under the sink. The valve was just sitting on a pipe by less that a thread. Good, found the problem and off to the local hardware store. For the cost I decided to replace all three valves. I noticed that our coach manufacturer did not use any sealant on the treads so I got out my teflon tape (I was proud of myself for bringing a roll) and installed the new devices.
All fixed except for that little voice in my head telling me that it didn't make sense. Posts had talked about grey water smelling bad but we rarely allowed any food into the grey tank. Then I slowly remembered a post talking about making a P-Trap in his large hose going to the sewer.
Then the rest of the story evolved in my brain. I had switched from our "The SewerSolution" to the classic 4" hose. While the sewer solution was great when we had to pump our waste 50' while we were in WI it does take some time to empty the tank. I figured we were very close to the down pipe so why not use the big hose and be able to dump quickly. And that was where the problem raised it little head.
The fans would put a negative pressure in the coach and the path of least resistance was from the sewer through the grey tank and through the faulty AAV into our coach. Stinky, stinky! So now I made a simple P-trap (see picture) in the hose going to the sewer and all is good. I will also make sure that there is always a window cracked when running the fans.
The many people who have posted in the past helped me figure out what was wrong (and what we were doing wrong) and maybe my experience will help someone else. Thanks to all that have come before me.
John, Donna and Ginger