PH is actually supposed to be at 7.2-7.5 before starting the SLAM. At this point, continue with the SLAM (thoroughly) by maintaining it until you pass all 3 criteria. Don't let that FC SLAM level drop. Once the SLAM is done, then you can go back and adjust the PH.
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The 3 SLAM objectives are:
1. Water is clear
2. You do not lose any more than 1ppm of FC overnight (that's the OCLT)
3. CC (Combined Chlorine) is <.5
Your pH is probably not high.... or at least not as high as you think. High FC reacts with the phenol read and it falsely reads high pH. Photographic proof!
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