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Re: very frustrated. water is now green? I see. After using up the 9 liter of Phosphate free chemical, I will discontinue its use. Thanks!

Split off of this topic. This was getting off topic for that thread. JasonLion Did you get your Phosphate level tested at the pool store? Before draining your pool to get the cya down to 40 ppm, you might want to check your Phosphate level. I have found the following links helpful. Phosphate...