: We have struggled with sewer gas smells emitting from our roof vents and really stinking up our yard. We have had all kinds of checks on it, mechanical system seems to be working properly..(any suggestions?) Saw somewhere, something about a pepperment injection to help alter this vented odor..help???

Shannon,
I don't know about peppermint,
You may want to look into the Bio-Clean information though. Terry

• Bio-Clean