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My CYA is 40 and my shock level is 16 FC . on several occasssion during shocking, I only seem to get it up to about 9 FC before I reach 0.5 or 0.0 CC. Why is that? Should I be getting to 16 FC or is the more important fact 0.0 - 0.5 CC?

I am getting ready to open my pool and I have been searching for a remedy for my pool problems. Last year,my first year being a pool owner, I had trouble getting a CHL reading. After getting my water tested, it was discovered that my nitrate levels were high. The pool store said there was...