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Thanks for the replies! What happens when you let the tub sit after draining? Should I always make sure I have enough time to drain and refill immediately?!
Sounds like pseudonymous nothing that looks of chlorine and a few drainings will not fix.
I would also suggest that if you are going to leave it a few days to pull the filters out, clean them and let them air dry. Dont leave them in the tub, they will grow real bad stuff quickly since all the containments are trapped in them.