Below are two methods to solve for the Langelier Saturation Index. Method 1 automatically calculates the various factors (temperature, hardness and alkalinity). For method 2, the user will need to manually look up the values from the table and place the values into the calculator.
Water Temperature (°F) | Temperature Factor (TF) | CaCO3 PPM | Calcium Hardness (CF) | Total Alkalinity PPM CaCO3 | Alkalinity Factor (AF) |
32 | 0.0 | 5 | 0.3 | 2 | 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 | 2.1 | 400 | 2.6 |
105 | 0.9 | 800 | 2.5 | 800 | 2.9 |
128 | 1.0 | 1000 | 2.6 | 1000 | 3.0 |
Langelier Saturation Index (SI) | Condition |
-0.5 < SI <0.5 | balanced |
> 0.5 | scale forming over saturated |
< 0.5 | corrosive under saturated |
Langelier Saturation Index | |
pH (test kit) | |
temperature factor | |
calcium hardness factor | |
alkalinity factor |
turnover rate or time | |
pool volume or size | |
pump flow rate |
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