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...