在化学消毒剂中，臭氧和二氧化氯被认为是对抗隐孢子虫卵囊的唯一有效屏障。氯和氯胺被认为对隐孢子虫无效，拟议的长期2强化地表水处理规则（LT2ESWTR）中没有关于氯和氯胺灭活隐孢子虫的C？T表。然而，文献中已经讨论了强消毒剂（如臭氧）和弱消毒剂（如氯或氯胺）之间协同灭活的概念，一些研究人员已经公布了他们的研究结果。这篇文章的作者综合了其中三项研究的数据，并利用它们开发了一个C？T表，用于臭氧下游氯胺灭活隐孢子虫。 他们的研究结果表明，在臭氧下游延长氯胺接触时间的情况下，协同灭活隐孢子虫可以为水处理厂带来巨大的好处。公用事业管理人员可能会发现本文的结论和建议的表格有助于提高其设施满足LT2ESWTR下潜在隐孢子虫灭活的能力。作者希望这样一个C？T表将被纳入该规则的最终版本。

Among chemical disinfectants, ozone and chloride dioxide have been deemed the only viable barriers against Cryptosporidium oocysts. Chlorine and chloramine have been considered ineffective against Cryptosporidium, and no C ¿ T table for the inactivation of Cryptosporidium with chlorine and chloramine is included in the proposed Long Term 2 Enhanced Surface Water Treatment Rule (LT2ESWTR). However, the concept of synergistic inactivation between a strong disinfectant (such as ozone) and a weak disinfectant (such as chlorine or chloramine) has been discussed in the literature, and several researchers have published results of their investigations. The authors of this article consolidated data from three of these studies and used them to develop a C ¿ T table for the inactivation of Cryptosporidium with chloramine downstream of ozone. Their findings indicate that synergistic Cryptosporidium inactivation with extended chloramine contact time downstream of ozone can provide substantial benefits to water treatment plants. Utility managers may find the article's conclusions and proposed table help to improve their facilities' ability to meet potential Cryptosporidium inactivation under the LT2ESWTR. It is the authors' hope that such a C ¿ T table will be included in the rule's final version.