I am just stumped Although it may be algae, my pool used up about 7ppms of chlorine today, which is very high with a cya of 50, the only swimmers were my husband and I, I don't think we have that many cooties. I just can't fiure out why it clouds with the addition of bleach, using up sequestering agent sounds right, but I really don't think I have too much sequestering agent in it, I will have to test it with the sequestering kit I just got, and have been too busy to look at