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I just drained and refilled my plaster pool here in AZ, where the water is very hard. My CH is now reading 74 ppm, and recommending I add 73 lbs of Calcium Chloride. Can that be accurate? How can it be so low with such hard tap water?

I currently have a Pentair System 3, 600 sq ft cartridge filter. I'm due for new filter cartridges and in my search have learned they don't make this filter system anymore and the cartridges are very difficult to come by, not to mention crazy expensive if you can find them. Leslie's recommended...