# The Langlier Index

 Temp deg F = TV Calcium Hardness = HV Total Alkalinity = AV 32° = 0.0 5 = 0.3 5 = 0.7 37° = 0.1 25 = 1.0 25 = 1.4 46° = 0.2 50 = 1.3 50 = 1.7 53° = 0.3 75 = 1.5 75 = 1.9 60° = 0.4 100 = 1.6 100 = 2.0 66° = 0.5 150 = 1.8 150 = 2.2 76° = 0.6 200 = 1.9 200 = 2.3 84° = 0.7 300 = 2.1 300 = 2.5 94° = 0.8 400 = 2.2 400 = 2.6 105° = 0.9 800 = 2.5 800 = 2.9 128° = 1.0 1000 = 2.6 1000 = 3.0 pH ___ + TV ___ + HV ___ + AV ___ — 12.1 = Langlier Index

If Index is between -0.5 and +0.5 the water is Balanced

If Index is less than -0.5 the water is Corrosive

If Index is greater than +0.5 the water is Scale Forming

## Fill in the form below to calculate your Langelier Index

 Total Alkalinity: 5 ppm 25 ppm 50 ppm 75 ppm 100 ppm 125 ppm 150 ppm 200 ppm 250 ppm 300 ppm 400 ppm 800 ppm 1000 ppm Calcium Hardness: 5 ppm 25 ppm 50 ppm 75 ppm 100 ppm 125 ppm 150 ppm 200 ppm 250 ppm 300 ppm 400 ppm 800 ppm 1000 ppm Temp. (°F): 32 °F 37 °F 46 °F 54 °F 61 °F 66 °F 75 °F 80 °F 85 °F 90 °F 95 °F 98.6 °F 100 °F 102 °F 104 °F Measured pH: