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Background info: 26k gallon gunite/pebbletec pool that is almost 3 years old. I’ve always done the maintenance, following the TFP guidelines. Pentair cartridge filter that I clean regularly, SWCG running to spec and I maintain FC between a low of 4 and a high of 7. I’m usually falling in the 5-6...

I have a 26,000 gallon plaster pool in San Diego, CA. It's about 2 years old and the calcium hardness has been slowly creeping higher due to evaporation. It's currently at 750 ppm, which is well above the recommendations here. My source water from the tap is about 250 ppm. I've asked around...