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Langelier Saturation Index

A calculated number used to predict the calcium carbonate (CaCO3) stability of a water; that is, whether a water will precipitate, dissolve, or be in equilibrium with, calcium carbonate.

It is sometimes erroneously assumed that any water that tends to dissolve CaCO3 is automatically corrosive.

Langelier saturation index = pH - pHs where pH = actual pH of the water, and pHs = pH at which the water having the same alkalinity and calcium content is just saturated with calcium carbonate.

See Also: Saturation Index Rzynar Index Saturation Index