地表水处理规则（SWTR）是要求优化过滤条件的重要一步。自那以后，许多公用事业公司都以更雄心勃勃的目标取代了每台SWTR 95%的时间遵守0.5 NTU的限制，例如保持在0.1 NTU以下，提供3 log的囊肿大小颗粒清除，或提供低于50粒/毫升的过滤水。建议的消毒剂/消毒副产品规则（D/DBPR）包括通过强化混凝优化总有机碳（TOC）去除的程序。这些目标需要优化混凝和过滤条件，以去除颗粒物和DBP前体，以及更传统的参数，如浊度和锰。 本文介绍了罗利市E.M.约翰逊水处理厂的工厂优化案例研究，重点是过滤器操作。对颗粒物去除、锰去除和消毒副产物控制方面有时相互冲突的要求进行了评估。

The Surface Water Treatment Rule (SWTR) was a major step towards requiring optimized filtration conditions. Compliance with a 0.5 NTU limit 95% of the time per the SWTR has since been superceded at many utilities by more ambitious goals such as keeping below 0.1 NTU, providing 3 log removal of cyst-sized particles, or providing filtered water with under 50 particles/ml. The proposed Disinfectants/Disinfection By-Products Rule (D/DBPR) includes a procedure for optimizing total organic carbon (TOC) removal through enhanced coagulation. These goals require optimizing coagulation and filtration conditions for removal of particulates and DBP precursors as well as the more traditional parameters such as turbidity and manganese. This paper presents a case study of plant optimization at the City of Raleigh's E.M. Johnson Water Treatment Plant, focusing on filter operations. The sometimes conflicting requirements of particulate removal, manganese removal, and control of disinfection byproducts are evaluated.