My basement drain works fine, but it seems to be getting a sewer gas smell from time to time, particularly during dry weather. I'm trying to figure out how to stop it. Any ideas?
Likely your drain already has a "P" trap in it, otherwise you would have odor most of the time. What is most likely happening during dry weather is the water in the trap is evaporating and letting the sewer gas pass. The solution is to pour about a qt. to ½ gal. of water in the drain once a week, this will keep the trap full and sealed.
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