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Is that bathroom used much? Our 3rd bathroom tub never gets used. As a result (we surmise), the water in the drain evaporates, allowing sewer gas to find its way into the house. We just run the tub for a minute every week or two to fill the drain. Haven't had the problem since.


You have sewer gas. Water in your plumbing traps is supposed to prevent that. There's some problem that is resulting in not having a water seal in your traps for these items (they may share one trap if it happens to both at the same time.) If you pour water down the affected fixture (slowly) does the odor stop shortly thereafter? Or, if you carefully do ...

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