I've got a problem with sewer odor coming from a floor drain. I assume this only happens if the trap does not have enough water to close off the air path. And, I assume there are only two reasons why the trap might be dry: evaporation and a leak in the trap. Since water is periodically poured into the trap I'm leaning towards the fact that there is a leak. But before I go to the trouble and cost of tearing up the concrete floor to verify this I'd like to solicit comments from the experienced listnerers out there for suggestions and ideas on what to try to test my assumptions.
Some thoughts I've had:
Is there a video inspection technique that could verify a leak?
Someone suggested pouring mineral spirits into the drain (won't evaporate like water). (Will this cause any problems on a septic system?)
Thanks for any ideas.
John Keith snipped-for-privacy@juno.com