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This past week I added 16 oz. of CYA using the sock method for a couple of days, after testing results showed 35ppm, trying to bring it up to 45ppm in my 11,000 gal pool. Today it tested at 25ppm! Checked it twice to confirm. Can anyone tell me how that can happen? Also my CH increased to 625ppm...

Moved from here. S: I had a similar question and thank you for the response Jim! My test results were: Tested FC with previously owned Taylor K-1004 test kit and got FC=1. Tested FC with TF-100, included K-1000 test kit and got FC=6. Then FAS-DPD test in TF-100 and got 2.5. Thank you for your...