Langelier Saturation Index Calculator

Calculate LSI = pH - pHs to evaluate water corrosivity and scaling tendency.

Measured pH of the water. Drinking water range: 6.5-8.5.
Water temperature affects CaCO3 solubility.
°C
TDS affects ionic strength. Typical: 100-1000 mg/L.
mg/L
Calcium hardness as CaCO3.
mg/L CaCO3
Total alkalinity as CaCO3.
mg/L CaCO3

Results

Saturation pH (pHs)-
Langelier Index (LSI)-
Ryznar Index (RSI)-
Aggressive Index (AI)-
Water Tendency-
Reference: Langelier (1936) JAWWA. LSI = pH - pHs where pHs = (9.3 + A + B) - (C + D).