Bumping this topic. My CH was 250, and Pool Math instructed me to add 150 lbs of calcium chloride. My FC was 7.5. I added 125 lbs 3 days ago, and my FC went to 1.0 the next day. I added 6 gallons of 12.5% bleach, and tested the next day to find FC was 0. I then added 9.5 gallons of 12.5% bleach...