CYA of 120 is still way too high--you need to strongly consider another drain/refill. And with your Cl test, you need to try diluting your test sample with distilled water 1:1, read your result, then multiply by 2. If that's not high enough, you can dilute it 1:2 and multiply by 3. Either way, you need to make sure that you're still maintaining high enough chlorine levels for that high of a CYA level.
Are you still running your filter 24/7? What are you using for shock?
Janet
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