Posted by Vic famous PlumbingSupply.com on December 10, 1997 at 06:05:25:
In Reply to: rotten egg smell posted by Jeff on December 09, 1997 at 22:21:39:
Sounds like a floor drain.
If it is, then try adding a quart or more of water.
If it goes away the cause is a p-trap below that holen that is supposed to be filled with water. The water stops most odors from entering the area. This odor is from your sewer or septic tank.