I am in individual homeowner with a large aerobic septic system. Two people live in my home including myself. We mostly use the upper level of the home and the lower level is used mostly for storage and laundry since our son graduated from college.
My problem is that for the last week to ten days, there is a horrible smell coming up from downstairs. It seems to be emanating mostly from the double sinks in the lower level bathroom. We’ve tried running lots of water down the drains, flushed additional bacteria down the toilet, and used “Draino Foamer”–all to no avail. Any suggestions?