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I've used this method for the past few summers with no problems but I am trying to help a friend. They've used chlorine for years and this year are having problems with a crystal clear pool testing at zero fc. I tested a sample with the tf-100. Their cya is 60. What could be the problem...

Hi everyone! I am excited to try the BBB method after a few years of baquicil my wallet and I have had enough!! We are having to put in a new liner this year and will have water delivered. I have a 24 ft above ground, 13,500 gallons. What will I need to do next?