What tests are valid with high chlorine?

ewinter

Member
Nov 8, 2020
19
NJ
I opened my pool last week, and in just a few days, it started going green. Before I ran any tests, I dumped in a lot of chlorine, and I now have FC at 22. What tests can I run with the chlorine so high? I've seen on this website that pH won't be valid. How about cyanuric acid or alkilinity?
 
Only the pH test is invalid at high FC. The TA and CH tests can be the wrong color (though that's unlikely at only 22 ppm) but if that were to happen you'd just look for it to change from one color to another, whatever those colors might be. They would still be accurate.
 
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