Water Chemistry

LSI Calculator
(Water Balance)

Calculate the Langelier Saturation Index to prevent scaling and corrosion in your pool system

Enter Water Chemistry Values

Input your current pool water test results to calculate the LSI and receive water balance recommendations.

Typical range: 70-90°F

Ideal range: 7.2-7.6

Ideal range: 80-120 ppm

Ideal range: 200-400 ppm

Typical range: 1000-2000 ppm

Understanding LSI

LSI Scale
Interpretation

< -0.3

Corrosive

Water will dissolve calcium, potentially damaging pool surfaces and equipment.

-0.3 to 0.3

Balanced

Optimal range with minimal scaling or corrosion risk. Water is properly balanced.

> 0.3

Scaling

Water will deposit calcium scale on pool surfaces, equipment, and plumbing.

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