通过在宾夕法尼亚州北部一个小型社区的地表水源进行试点示范的案例研究，对采用接触澄清和过滤的两级水处理系统的性能进行了检验。研究表明，该系统产生的水质超过了州和联邦的浊度、金属和贾第虫去除标准。水处理系统可从作者的公司购买，分为成套、模块化和大型工厂。

The performance of a two-stage water treatment system employing contact clarification and filtration was examined via a case study of a pilot demonstration conducted at a surface water source serving a small northern Pennsylvania community. The study demonstrated that the system produced water quality surpassing state and federal standards for turbidity, metals, and Giardia removal. The water treatment system is commercially available from the author's company in package, modular, and large scale plants.