最近，人们的注意力集中在过滤器成熟期，此时大量颗粒，尤其是隐孢子虫大小范围内的颗粒，可以通过过滤器并可能进入供应。之前的研究表明，在过滤过程中，流速变化是不可取的，可能会导致颗粒物突破。在最近的隐孢子虫暴发后，这一点已引起工厂运营商的注意。然而，到目前为止，还没有发表任何工作能够从滤液颗粒计数的角度对这种影响进行量化。本文提供的实验数据显示了流速变化对英国和美国工厂滤液颗粒数的影响。包括7个参考文献、图表。

Recently, attention has focused on the filter ripening period when high numbers of particles, particularly in the cryptosporidium size range, can pass through filters and potentially into supply. Previous work suggested that flow rate changes were inadvisable during filtration and could lead to particulate breakthrough. This has been brought to the attention of plant operators following recent cryptosporidium outbreaks. However, to date no work has been published that actually quantifies the effect in terms of filtrate particle counts. Experimental data are presented that show the effects of flow rate changes on filtrate particle counts for plants in the United Kingdom and the US. Includes 7 references, figures.