puchinno12 wrote:
Thanks for the responses. The bowl has water in it when I back flush. The air admittance valve may have something to do with it, but seeing as how I am in Mexico for another couple months, I 'll have to wait till I get back to the States for a replacement. I thought maybe the vent line was plugged, but nadda. I have been using the fan to remove the smell" AFTER " backflushing and I will keep on doing so. It's not a major catastrophe by any means but it is a nuisance. Thanks again for taking the time to respond.
Does your bathroom sink drain go to black tank?
If so pace a baggie over the air admittance valve when backflushing.
If it doesn't ..........then smell is NOT coming back thru the AAV