The Langelier Index is an approximate indicator of the degree of saturation of calcium carbonate in water. It is sometimes referred to as the Langelier Saturation Index. In the calculation, it is the difference between the actual pH and a calculated pH.
The Langelier Index is an important characteristic in a potable water system:
The Langelier Index is calculated using pH, alkalinity, calcium concentration, total dissolved solids and water temperature.
Calculations of the Langelier Index
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