LSI Tool

A clearer way to calculate LSI.

Enter current water readings for an immediate Langelier Saturation Index using the same continuous method as TrackLiquid Calculator v1.9.6.

LSI: +0.00

Balanced

Water is within the balanced LSI range.

pH

Water temperature (°F)

Total alkalinity (ppm as CaCO₃) Corrected: 79.8 ppm

Calcium hardness (ppm as CaCO₃)

Cyanuric acid / CYA (ppm)

Borate (ppm)

Total dissolved solids / TDS (ppm)

Results are estimates for current, well-mixed water. Confirm unusual readings and use professional judgment.

Method: TL-LSI-2.0

BUILT FOR A QUICK DECISION

Uses pH-dependent CYA and borate corrections rather than a coarse lookup shortcut.

See aggressive, balanced, or scale-risk status immediately, with transparent input limits.

Bring pH, temperature, TDS, calcium hardness, alkalinity, CYA, and borate into one continuous calculation.

TRACKLIQUID CALCULATOR FOR ANDROID

Take the field toolkit with you.

The Android app extends this free LSI tool with pool volume, chemical dosing, and offline operation in a technician-focused interface.

Continuous LSIVolumeDosingOffline operation

Opens the official Google Play listing.