现场规模袋式过滤系统的测试结果表明，4-6um聚苯乙烯微球可作为袋式过滤过程中隐孢子虫卵囊去除的可靠替代物。观察到4-6um聚苯乙烯微球和微小隐孢子虫卵囊的对数去除率之间存在近乎完美的线性相关。隐孢子虫去除与其他潜在替代物（包括4-6μm颗粒计数、1-25μm颗粒计数和浊度）之间的相关性产生了显著大于gt1的斜率，并且可能因原水水质的变化而在地理上有所不同。隐孢子虫卵囊和袋式过滤系统的潜在替代物在原木去除方面的相似性和差异性是由于它们在大小分布上的差异。 包括17个参考文献、表格、图表。

Testing of field-scale bag filtration systems yielded results indicating that 4-6 um polystyrene microspheres can be used as a reliable surrogate for determining Cryptosporidium oocyst removal in bag filtration processes. A nearly perfect linear correlation was observed between log removals of 4-6 um polystyrene microspheres and Cryptosporidium parvum oocysts. The correlations between Cryptosporidium removal and other potential surrogates (including 4-6 um particle counts, 1-25 um particle counts, and turbidity) produced slopes that were substantially >1 and may vary geographically because of variations in raw water quality. The similarities and dissimilarities in log removal between Cryptosporidium oocysts and the potential surrogates for the bag filtration system resulted from their differences in size distribution. Includes 17 references, tables, figures.