Langelier Saturation Index Calculator
Calculate scaling potential
Method and interpretation
LSI = pH − pHs
The indications for the LSI and the improved LSI by Carrier are based on the following values:
| LSI | Indication |
| LSI<0: | Water is undersaturated with respect to calcium carbonate. Undersaturated water has a tendency to remove existing calcium carbonate protective coatings in pipelines and equipment. |
| LSI=0: | Water is considered to be neutral. Neither scale-forming nor scale removing. |
| LSI>0: | Water is supersaturated with respect to calcium carbonate (CaCO3) and scale forming may occur. |
| LSI (Carrier) | Indication |
| LSI < -0.5: | Serious corrosion |
| -0.5 ≤ LSI < 0: | Slightly corrosive but non-scale forming |
| LSI = 0: | Balanced but pitting corrosion possible |
| 0 < LSI < 0.5: | Slightly scale forming and corrosive |
| 0.5 ≤ LSI ≤ 2: | Scale forming but non corrosive |
| LSI > 2: | Strong scale-forming tendency |
[1] : Kevin Rafferty, Scaling in geothermal heat pump systems, U.S. Department of Energy (july 1999)
[2] : Metcalf and Eddy, Wastewater Engineering Treatment and Reuse 2003
Explanation of the Langelier Saturation formula.
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