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There is nothing particularly advanced anout a flush toilet with an s-curve, and the miasma theory is very old.

So, what if an older society had developed the flush toilet, with s-curve? We could go with the Romans, but its not like they invented indoor plumbing, so it could be any society with running water. This would also mostly be just for the wealthy, though I could see the Romans upgrading a few public restrooms to include these features, perhaps as part of some grand building project.

Another consideration is that the collection of urine for commercial purposes might have to be adjusted slightly, if these are common enough.
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