LSI and Chemical Dosing Calculator for pool chemistry

Latest Version (APK)


Version1.3.2 (13)
Size21 MB
Installs 1,000


Free download LSI Calculator 1.3.2 apk app latest version for android


LSI Calculator is a free app for balancing water chemistry.

The Langelier Saturation Index (LSI) has been around since the 1930s but was adapted to swimming pools after the introduction of Cyanuric Acid (CYA) in the 1960s. This app factors in CYA and all five of the original factors: pH, carbonate alkalinity, calcium hardness, water temperature and total dissolved solids (TDS).

Without an app calculator, figuring out LSI balance takes math, a reference chart, and time; valuable time that pool operators rarely have in the field. LSI Calculator not only shows the LSI balance instantly, it gives precise dosing calculations for how to fix the water.

We approach water chemistry with a minimalist philosophy; a more deliberate, meaningful treatment program with less. Less waste, chemical demand, and problems.

Next Generation Water Science is a focused brand of all-natural, specialty water treatment chemicals. Visit for more information.

What's New

Access to telephone contacts or call history has been removed.
Fixes for Android 9.

Latest Version

LSI Calculator 1.3.2

Updated: 2019-09-30 (2 months ago)

1.3.2 (13) 2019-10-14
1.3.1 (11) 2019-05-12
1.3 (10) 2018-06-09