Nope never, but I do have fake poop I throw in the pool for parties.
But to answer your questions, it depends if it is wet or chunky. I mean a firm turd is fine, just scoop it out and the chlorine will do its job. If someone had an explosion in their shorts, it would likely be a situation I would need to clear the pool and clean it for a few days. As someone who poops on a regular basis, I noticed the consistency changes often.