This is probably a late answer, but I'd say that if the cloudiness is due to beginnings of an algae or other bacterial bloom, then no, I wouldn't let my kids swim in it. If it's because you cleaned your filter and had a little DE blow back into the water, then it's your call. If you do decide to let them swim, I'd definitely make sure the pool isn't so cloudy that you can't see them when they're under water in the deep end.
Janet
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