LSI — Langelier Saturation Index
Predicts whether water will dissolve or deposit calcium carbonate. The benchmark for cooling towers, pool chemistry and low-TDS drinking-water stability.
Saturation pH (pHs)
7.79
LSI · Balanced
-0.187
Minimal scaling or corrosion — stable water.
LSI verdict
At pH 7.6, 20 °C, TDS 400 mg/L, calcium 150 and alkalinity 120 mg/L as CaCO₃: pHs = 7.79, LSI = -0.187. Water is balanced.
Minimal scaling or corrosion — stable water.