本文论述了递减率过滤器的管理法规，并介绍了选定的全尺寸递减率过滤器工厂的运行经验。介绍了控制过滤系统的设计原理和运行原理。介绍了降速过滤控制优于恒速过滤控制的优点。对州法规的调查表明，对递减率过滤器的设计和运行没有具体要求，法规不允许区分这两种类型的过滤器。介绍了以下递减率过滤器工厂的运行经验总结:位于密歇根州底特律的西南和水厂公园工厂；圣彼得堡的中心工厂和连锁岩石水处理厂。 密苏里州路易；达莱卡里亚水处理厂；弗吉尼亚州切萨皮克的西北河水处理厂；以及亚利桑那州凤凰城的鹿谷水处理厂。包括12个参考文献、表格、图表。

This article addresses regulations governing declining-rate filters and presents operating experiences from selected full-scale declining rate filter plants. The design and operation principles of constantrate and declining-rate filtration are discussed, and influentcontrolled and effluent-controlled declining-rate filter systems are described. Advantages of declining-rate filtration control over constant-rate filtration control are presented. A survey of state regulations indicates that no specific requirements exist for the design and operation of declining-rate filters and that regulations do not allow for differentiation between the two types of filters. Summaries of operating experiences at the following declining-rate filter plants are presented: the Southwest and Water Works Park plants in Detroit, Michigan; the Central Plant and the Chain of Rocks Water Treatment Plant in St. Louis, Missouri; the Dalecarlia Water Treatment Plant; the Northwest River Water Treatment Plant in Chesapeake, Virginia; and the Deer Valley Water Treatment Plant in Phoenix, Arizona. Includes 12 references, table, figures.