A few months ago I switched from an Apex Classic to a 2016 and since then my pH has been varying between 7.5 and 7.7. With my Classic it was always in the 8.0 to 8.3 range. Nothing else really changed in my system. My pH would vary slightly depending on whether the windows were open or closed but it was never too much of a swing. I feed my air intake on my skimmer with an line from outside. I've tried to re-calibrate it multiple times with the same result. Tonight I re-calibrated and checked the readings against the calibration solutions afterwards. I got a reading of 6.71 in the 7.0 solution and 9.72 in the 10.0 solution. Any ideas? Thanks.
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