研究了颗粒介质过滤器在预氯化、反冲洗氯化和非氯化条件下的物理性能。总的来说，生物过滤产生了高质量的水。尽管污水浊度表明生物过滤器和传统预氯化过滤器的性能差异不大，但颗粒计数也存在差异。尽管预氯化产生的净颗粒去除率略高于生物过滤，但去除颗粒的总体数量级和尺寸范围是相似的。生物过滤也产生了经济的过滤器运行时间。包括20个参考文献、表格和图表。

The physical performance of granular media filters was studied under prechlorinated, backwash-chlorinated, and nonchlorinated conditions. Overall, biological filtration produced a high-quality water. Although effluent turbidities showed little difference between the performance of biological filters and conventional prechlorinated filters, differences were shown with particle counts. Although prechlorination yielded slightly better net particle removal than biological filtration, the overall order of magnitude and size range of particles removed was similar. Biological filtration also produced economical filter run times. Includes 20 references, tables, figures.