Watermom, I will go along with you on this, because you know more than I do about pools, but I thought as long as you don't have cc then it is ok to swim. I was thinking the chlorine loss was due to the chlorine breaking down the dead stuff (watermold) so it could be filtered out. I know when I was fighting watermold the water took a while to clear, and it used up mega doses of chlorine. It took almost a week for the water to get back to it's regular sparkly clean look. I am very interested in you answer, thanks