I agree with Rich. How could your Ca be that high?
How did you test it? My Salifert kit only reads up to 500. Did you refill the syringe a couple times to get the 1300 to 1500 reading?
Correct me if I'm wrong, but I believe a Ca reading anywhere over 500 will cause precipitation, and buildup on warm/electrically charged hardware. You'd have caked calcium all over your pumps/heaters and probably everything else it wants to attach to!!
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