It's safe for kids . . . but not expensive swim suits. You must have some stabilizer -- otherwise you'd lose all the chlorine in 1/2 day's sunshine, so it may not be a problem even for swimsuits.
My older son swam for a month, 2 - 3 hours per day in a pool with zero stabilizer (indoors) and 20 - 30 ppm chlorine because their ORP controller was mis-calibrated. I finally had to threaten to call the health department to get them to fix it. It killed two of his swim suits, and turned his hair ash colored (from brown) but otherwise didn't hurt him.
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