Quote Originally Posted by smallpooldad
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If you keep the pH between 7.2 - 7.4 (it keeps the metals in solution) you should not have too many stain problems. Keep the REAL alkalinity between 90 and 100, this to helps keep the metals from falling out of solution, using your CYA number to adjust this. Example a CYA of 60 X ph 7.4 adjustment of .33 gives a reading of 19.8. So your alkalinity should read 120 on your test kit to get a real alkalinity of 100.2. At a CYA of 40 the adjustment is 40 X .33 or 13.2 so your reading should be around 110 to get a real count of 96.8.
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I've never heard of this relationship between CYA/pH/TA. Can you elaborate and/or post link that explains this? Thanks!