本研究的目的是提供通过常规治疗和直接过滤去除贾第虫和隐孢子虫的有效性数据。具体目标旨在通过研究去除贾第虫和隐孢子虫的最关键关系，解决与制定新法规相关的一些问题。这些关系包括:通过常规治疗和直接过滤去除贾第虫和隐孢子虫的效果比较；比较去除贾第虫和隐孢子虫的效果； 比较去除贾第虫和隐孢子虫与去除混浊、囊肿大小颗粒和异养细菌的效果。

The study objective was to provide data on effectiveness of removal of Giardia and Cryptosporidium through conventional treatment and direct filtration. The specific objectives were designed to address some of the questions associated with the development of the new regulations by examining the most critical relationships in the removal of Giardia and Cryptosporidium. These relationships are: a comparison of the effectiveness of Giardia and Cryptosporidium removal through conventional treatment with that resulting from direct filtration; a comparison of the effectiveness of Giardia removal with Cryptosporidium removal; a comparison of the effectiveness of Giardia and Cryptosporidium removals with the removals of turbidity, cyst-size particles, and heterotrophic bacteria.