直接过滤已被用作完整的常规处理系统的可行替代方案，该系统在过滤前采用絮凝沉淀，其中原水水源相对未受污染，颜色和浊度较低。通过向用于过滤器反洗的水中添加聚合物，除了大大提高反洗固体的沉降浓缩速率外，还可以缩短初始浊度突破期和峰值。这种处理的另一个优点是，当澄清池中相对清澈的上清液返回到处理列的前部时，废水排放量减少。 本文介绍了采用聚合物进料的中试工厂试验的结果。包括14个参考文献、图表。

Direct filtration has been used as a viable alternative to complete, conventional treatment systems that employ flocculation-sedimentation prior to filtration where the raw water source is relatively unpolluted and is low in color and turbidity. By adding a polymer to the water to be used for filter backwashing, a reduction of the initial turbidity breakthrough period and peak can be obtained in addition to a much improved settling-thickening rate for the backwash solids. Another advantage of this treatment is the reduced discharge of wastewater when relatively clear supernatant from clarifiers is returned to the front of the treatment train. Presented are results from pilot-plant tests that incorporated polymer feeding. Includes 14 references, figures.