1978年7月，俄亥俄州利马市一个小区住宅和共管公寓的家用冷水铜管道系统发生了大约25起点蚀故障中的第一起。调查表明，分配给社区的水促进和支持了点蚀；主要成分为溶解二氧化碳和溶解氧。大量硫酸盐和氯化物被认为促进了点蚀。介绍了通过添加碳酸钠来提高pH值和消除溶解二氧化碳的供水处理方法。点蚀攻击几乎立即减少，新的泄漏报告在六个月内停止。为了验证水处理程序的有效性，在处理厂安装了腐蚀测试回路。结果表明，暴露于苏打水的试管样本- 灰处理后的水没有出现点蚀，而暴露在未处理水下的管道在约20%的管道中出现了相当大的点蚀，其余管道中的点蚀较少。处理井水的成本估计为每个住宅每年5.58美元。包括4个参考文献、表格、图表。

In July 1978, the first of about 25 pitting corrosion failures occurred in the domestic cold water copper plumbing systems of homes and condominiums in a Lima, Ohio, subdivision. An investigation showed that the water distributed to the community promoted and supported the pitting corrosion; primary constituents were dissolved carbon dioxide and dissolved oxygen. Appreciable amounts of sulfates and chlorides are believed to have facilitated the pitting. Treatment of the water supply by addition of sodium carbonate to increase the pH and to eliminate the dissolved carbon dioxide was introduced. Pitting attack diminished almost immediately, and new reports of leakage ceased within six months. To validate the effectiveness of the water treatment program, a corrosion test loop was installed at the treatment plant. Results indicate that tube specimens exposed to the soda-ash treated water showed no pitting attack, while tubes exposed to the untreated water showed considerable pitting in about 20 percent of the tubes with less attack in the remainder of the tubes. Costs of treating the well water are estimated to be $5.58 per residence per year. Includes 4 references, table, figures.