Rust smell in overflow pipe
I have a Kohler Archer tub with a slotted overflow attached. We use this tub/shower at least once per day. In the past few months - I have noticed an odor coming from the overflow - it has a rusty/musty kind of odor. Surprisingly, the odor isn't coming from the drain. To test this out - I taped the overflow shut and see if the smell continued. It stopped in that bathroom. However, it then started smelling in the downstairs bathroom - but only in the sink overflow - the drain is fine. Does this sound like a clogged vent pipe - or something worse? I have cleaned/bleached everything numerous times, and there doesn't appear to be a problem with the water flow.
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