Is softened water more corrosive?

No. Because the Langlier (calcium saturation) Index is lowered in water that has had calcium removed, skeptics sometimes consider softened water to be more corrosive. But softening of water via cation exchange does not make water more corrosive.

In fact, the U.S. Environmental Protection Agency (USEPA) and the American Water Works Association have both recently corrected their enclosed brochures as to the misconception that ion exchange softening has an effect on the corrosivity of water. Municipal water systems often use calcium carbonate saturation indices to help control precipitation in city water mains. This information is useful where utilities try to lay down a protective film in hopes of retarding the rate of corrosion in municipal distribution systems.

The Langlier Index (LI) is such a calcium carbonate saturation index that measures the potential of a water to deposit calcium carbonate scale. Water with an LI greater than zero tends to be of higher hardness and alkalinity ... more.

It has been found that ion exchange softening has no effect on the corrosiveness of water. Water pH, dissolved oxygen content, ammonia, chloride and flow velocity cause corrosion. These factors are unaffected by the softening process.

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