Use Printable “Langlier Saturation Index” for these Problems
1. Total alkalinity = 50 ppm; pH = 7.0; Calcium Hardness = 200 ppm & Temperature = 76°F. What is the saturation index value?
2. Total alkalinity = 75 ppm; pH = 7.6; Calcium Hardness = 300 ppm & Temperature = 84°F. What is the saturation index value?
3. Total alkalinity = 150 ppm; pH = 8.0; Calcium Hardness = 400 ppm & Temperature = 94°F. What is the saturation index value?
ANSWERS
1. ALKALINITY Factor + pH + CALCIUM HARDNESS Factor + TEMP. Factor – 12.1
1.7 + 7.0 + 1.9 + 0.6 – 12.1
Saturation Index = -0.9 (Water is Corrosive)
2. ALKALINITY Factor + pH + CALCIUM HARDNESS Factor + TEMP. Factor – 12.1
1.9 + 7.6 + 2.1 + 0.7 – 12.1
Saturation Index = +0.2 (Water is Balanced)
3. ALKALINITY Factor + pH + CALCIUM HARDNESS Factor + TEMP. Factor – 12.1
2.2 + 8.0 + 2.2 + 0.8 – 12.1
Saturation Index = +1.1 (Water is Scale Forming)