I have one sink that has smelly running water. It is not the smell of sulfur, it just smells almost stale, possibly metallic. The stopper area, which is metal has turned green. It smells when it runs hot and cold. There is a shower in the same bathroom, but it doesn't have the same smell...and the other two bathrooms and kitchen also do not have odor problems. What could this be? Is it safe?
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