The Langelier Saturation Index (LSI), also called the saturation index for pools, is a calculation used to determine whether your pool is well balanced.
If the result is between -0.5 and 0.5, the water is balanced.
If it is below -0.5 or over 0.5 your water is either over or under saturated, which can lead to problems.
Add the necessary adjustment products to bring your
Total Alkalinity, pH and Total Hardness within the proper standards, then retest.
Ideal readings for proper water balance:
- Total Alkalinity: 80-120 ppm (parts per million)
- pH: 7.2-7.8
- Calcium Hardness/Total Hardness: 200-400 ppm
Determine Your Water’s Saturation Index
Test the water for pH, Alkalinity, Calcium Hardness and Temperature. Then, enter the information below.
