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I will try the CYA test in a different setting, thank you.

Interesting, I will do this.

I haven't been aiming for a certain number. The block test for Free Chlorine always has yellow in it. Often it is dark yellow and I'll do a drop test and get a number like 7 or 11. I'll scrub the pool today and keep adding chlorine to keep it at 12 to try and clear this. Thank you.

This is my first year using a TF-Pro test kit. I've been struggling with reading the PH and CYA levels and wonder if that is my problem. These pictures are from today and here are my test results for today: PH = ? 8 maybe? Probably too high Free Chlorine = Visually looks like it's between 2 and...