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Does it matter if csi is -.5 or -.2 or 0.0 with a high CH of 550ppm I think it is better with a slight negative value to keep calcium from forming on pool surfaces, true or false? Pool math States -.6 to +.6 is satisfactory. TF-1000 test kit. Using Liq. Chlorine and pool math. FC 12 TC 12 CC 0...