Langelier (LSI) & Ryznar (RSI) Indices: Predicting Calcium Carbonate Scaling & Corrosion

Chemical equilibria equations for cooling towers, heat exchangers, and municipal water main stability.

Published by Sarah Jenkins, PE, BCEE (Water Treatment Principal) • June 30, 2026

Evaluating water aggressiveness requires solving calcium carbonate saturation pH (pHs) based on temperature, TDS, calcium hardness, and total alkalinity.