水处理行业正面临新的压力，这导致一些标准过滤实践的重新评估。这些压力包括:增加对囊肿切除的关注；避免消毒副产物（DBPs）；更多地依赖颗粒计数来监测治疗效果；以及控制治疗费用。由于过滤是去除颗粒（包括寄生虫囊肿）的最终屏障，这些压力重新引起了人们对过滤介质设计的兴趣。本文回顾了颗粒去除的基本原理以及最近的中试和全尺寸性能结果，以预测过滤介质设计的以下趋势:更深的过滤箱；深层单媒体或深层双媒体设计将取代多媒体设计成为最先进的设计；增加装载率；以及空气反冲洗系统。

The water treatment industry is facing new pressures that are resulting in the reevaluation of some standard filtration practices. These pressures include the following: increased attention to cyst removal; avoidance of disinfection byproducts (DBPs); increased reliance on particle counts to monitor treatment performance; and containment of treatment costs. Because filtration is the final barrier for particle removal, including parasite cysts, these pressures have resulted in a renewed interest in filter media design. This paper reviews the fundamentals of particle removal and the results of recent pilot- and full-scale performance to predict the following trends in filter media design: deeper filter boxes; deep-bed monomedia or deep-bed dual-media design will replace multimedia designs as state of the art; increased loading rates; and air backwash systems.