LSI = pH − pHs; pHs is calculated from temperature, TDS, calcium hardness and alkalinity. If LSI > 0 in the RO concentrate, antiscalant or acid dosing is required. It is also the basic reference for conditioning cooling towers and distribution networks.
Technical glossary· Water quality and measurement
Langelier Saturation Index (LSI)
Short definitionA calculated index that shows whether water is scale-forming (positive) or corrosive (negative) with respect to calcium carbonate.
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