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Question- “We live on the 3rd floor of an apartment complex and we have been smelling fumes coming from the sink and sometines the shower drains in our bathroom. Some of the residents on the first floor also have the same odor from their bathroom. Any solution?”

Answer- In our opinion, it sounds like this maybe a venting problem with the apartment complex. A smoke test would need to be done by a licensed plumbing contractor in your area to determine the root of the problem.