We are having a plumbing problem and I'm not sure how to fix it.
What is happening is water is backing up into the master shower (the furthest point of the plumbing) and it has a horrible smell. We haven't used this shower in a month or so because of it.
Sometimes it happens once or twice a day. I thought it was a venting problem, but as far as I can tell it is clear.
Any ideas of what this could be?