For a toilet located in a guest bathroom or a seldom-used room, you should flush it at least once every week or two. Letting stagnant water sit untouched in the bowl and tank for extended periods allows the water seal to evaporate completely, which lets foul sewer gases enter your home. Furthermore, standing water encourages mineral scaling, bacterial growth, and permanent porcelain ring staining. Verification: Check that the bowl water level remains at its normal height and flush the fixture periodically to maintain freshness.
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