Calculate swimming-pool water balance to prevent corrosion or scaling using the standard Langelier index method.
The Pool Langelier Saturation Index calculator helps aquatics facility managers and pool technicians perfectly balance water chemistry. By calculating the LSI from current water tests, you can prevent corrosive degradation of pool surfaces or the formation of damaging calcium carbonate scale on expensive filtration equipment.
An LSI value below -0.3 indicates corrosive water. The water is under-saturated with calcium and will begin dissolving plaster walls, grout, and concrete pool shells.
Unlike most substances, calcium carbonate becomes less soluble in warmer water. As pool temperature rises, the LSI increases, raising the risk of scale formation.
Yes. Cyanuric acid contributes to total alkalinity but does not protect against pH changes. You must subtract a portion of your cyanuric acid reading from total alkalinity for an accurate LSI.
Absolutely. Salt water pools typically have high Total Dissolved Solids. High TDS lowers the LSI, making accurate calculations critical to prevent corrosion of the salt cell.