How to read the LSI
- Perfectly balanced water is zero (0.00) LSI.
- Positive LSI values above +0.30 means the water is over-saturated and likely to form scale. The higher the number, the more saturated the water.
- Negative LSI values below -0.30 means the water is under-saturated and aggressive. It is likely to etch and corrode plaster surfaces and equipment. The lower the number, the less saturated the water, and the more corrosive it becomes.
LSI is calculated from six (6) factors:
- Water Temperature
- Calcium Hardness
- Carbonate Alkalinity
- Cyanuric Acid/Stabilizer
- Total Dissolved Solids (TDS)
Don’t worry, our pool dosing calculator does the math for you. Play around with each factor and watch how they affect the LSI score in real time.