Saturation Index

The Saturation Index (SI) is a method of determining whether water will deposit calcium carbonate or maintain
it in solution. In short it tells you whether your water is corrosive or scale forming. The SI incorporates the five
balance factors: pH, total alkalinity, calcium hardness, temperature, and total dissolved solids. For pool and
spa water, the ideal result of performing this index is to have a result of zero, i.e., SI = O. Balanced water is
between - 0.3 and + 0.3. Corrosive water is - 0.4 and lower. Scaling water is + 0.4 and higher. Having water
outside of the balanced range can contribute to extensive damage to the pool surface, equipment and
structure.

Saturation Index Factors

**High levels of Cyanuric Acid can contribute to false Saturation Index readings. Cyanuric acid should never be above 30 ppm due to the adverse effects on sanitizer activity