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I have tried the bleach to no avail. The previous owners mentioned that they didn't think a trap was initially installed.

My apologies--it is actually a p-trap that it is missing. We currently have the drain covered when not in use, but if we take it off, we tend to get a sewage smell emitting from it.

We have a...

Yes--it is an FDA requirement that all blood be tested.

Our shower in our upstairs bathroom does not have an s-trap. Is there a more simple fix to this than tearing out the entire shower?