研究表明，添加钙（如石灰）可以提高阿拉巴马州奥佩利卡市地表水供应地索加哈奇湖氧化锰的去除率。收集并测试了含有高锰和低钙浓度的样品，并对锰离子进行了氧化。氧化样品用补充钙离子处理，并通过小型快速砂滤器过滤。通过增加钙离子浓度，去除效率提高约90%。浊度去除以及明矾和pH值的影响也得到了解决。包括9个参考文献、表格、图表。

The addition of calcium (as lime) was shown to enhance the removal of oxidized manganese from Lake Saugahatchee, a surface water supply in Opelika, Alabama. Samples that contained high manganese and low calcium concentrations were collected and tested, and the manganese ion was oxidized. Oxidized samples were treated with supplemental calcium ion and filtered through small, model rapid sand filters. By increasing calcium ion concentration, removal efficiency was increased approximately 90 percent. Turbidity removals and the effects of alum and pH are addressed also. Includes 9 references, table, figures.