Copper is essentially immune to water-side corrosion. However, on occasion, pitting corrosion has been experienced in some communities supplied with water from well sources.

Such pitting can be prevented by treating the water. Successful treatments that have been demonstrated in the U.S. include the addition of soda ash, lime or caustic or simple aeration.

A computer program has been used to highlight the relative contributions to pitting aggressiveness of the various chemical constituents in potable waters.

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