Langelier index

Approximate Langelier index based on hardness, alkalinity, temperature and actual water pH.

Langelier index

This calculator estimates the Langelier index from hardness, alkalinity, temperature and the actual water pH. A positive index indicates a scaling tendency, a negative index indicates water that is corrosive towards calcium carbonate.

Input data

Actual water pH [–]

Water temperature [°C]

Calcium / hardness [value]

Water alkalinity [value]

Total dissolved solids (TDS) [mg/L]

Results

To display results, please enter all required input data (pH, temperature, hardness, alkalinity and TDS).

This calculation is indicative only; parameters and constants are simplified. Always use detailed analysis and applicable standards when deciding on water treatment.

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