除了尽可能降低施工成本外，创新的高速过滤工艺（如直接或在线过滤）为处理低浊度水提供了显著优势。华盛顿州埃弗雷特市已针对其优质水源优化了过滤实践，并正在实施这些技术，将其80 mgd处理厂扩建至225 mgd，而无需建造任何新的絮凝池或过滤器。1989年7月，开始进行中试规模的可处理性研究，以确定并验证拟议扩建的工艺改进。该研究强调优化过滤实践，制定设计和操作标准，以满足SWTR和预期的消毒剂/消毒要求- 产品规则。然而，本文将只讨论过滤优化。

In addition to minimizing construction costs, innovative high-rate filtration processes such as direct or in-line filtration offer significant advantages for treating low turbidity water. The City of Everrett, Washington has optimized filtration practices for their high quality source and is implementing these techniques to expand their 80 mgd treatment plant to 225 mgd without construction any new flocculation basins or filters. July 1989, pilot-scale treatability studies were begun to identify and verify process improvements for the proposed expansion. The study emphasized optimizing filtration practices and developing design and operating criteria for meeting the SWTR and anticipated Disinfectants/Disinfection By-Products Rule. However, this paper will only discuss filtration optimization.