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Here ya go. Checking out Leslie's recommendations. Looks like Alkalinity Upper first on list... can run that night test soon. Pool Chem 5/20/2025 ic40 indicating 3950ppm.

Installed an IC40 3/2024. New, the chlorine output at 70% was TOO HIGH. Point is, it worked great for a long time. Now, 14 months later, I am barely able to maintain 0.5 PPM @ 100% setting. I have cleaned it, but made no difference. There was very little scale build up. According to the...