50多年来，宾夕法尼亚州费城郊区自来水公司的皮克林溪水处理厂一直在使用氯胺。在此期间，氯胺化将原水中的大肠菌群数量从高达100000个生物体/毫升的数值降至成品水中的几乎为零。包括15个参考文献、表格和图表。

For more than fifty years chloramines have been used at the Philadelphia Suburban Water Company's Pickering Creek water treatment plant in Pennsylvania. During this period chloramination reduced the coliform count in the raw water from values as high as 100,000 organisms/mL to nearly zero in the finished water. Includes 15 references, tables, figures.