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Excellent. I'm still confused because I only go to the pool store to buy liquid chlorine, but when they test my water they tell me I don't need to buy so much chlorine. So they must not be too interested in profits, just unaware. I thought it was funny that I showed them the CYA/chlorine...

I have been doing the TFP method for ~18 months with good results. I have 15k in ground plaster. My CYA has been ~100 and reducing since beginning TFP. I have been maintaining 10 ppm chlorine and needed to shock twice to 30 ppm in the past year when I neglected to monitor chlorine. I use...