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)

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