In my guest bathroom (which we hardly ever use) I noticed a pulsating
sound coming out of the drain. It's freaky. It's rhythmic, about two
'thuds' per second. I checked under the sink, there's no leak. There
are no exhaust fans running in the house. I don't know if there's
anything else I need to check. Could there be an internal leak
somewhere? It's a hollow sound I dont' know how else to describe it.
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