使用中试规模的水过滤装置同时测量隐孢子虫卵囊和贾第虫囊肿的去除效率。采用多媒体过滤器的1-gpm中试装置在5 gpm/sq ft的直接过滤模式下运行。原水通过pH调节和明矾凝固得到良好调节。在试验过滤器运行期间，将精心制备和计数的隐孢子虫卵囊和贾第虫囊连续接种到原水中。通过对过滤前后采集的样本进行分析，来表征植物的性能。成熟期过后，隐孢子虫的最佳清除量平均为2.7至3.1个对数，贾第虫的平均清除量为3.1至3.5个对数。包括21个参考文献、表格和图表。

A pilot-scale water filtration plant was used to measure removal efficiencies of Cryptosporidium oocysts and Giardia cysts simultaneously. The 1-gpm pilot plant using multimedia filters was operated in the direct filtration mode at 5 gpm/sq ft. Raw water was well conditioned by pH adjustment and alum coagulation. Carefully prepared and counted Cryptosporidium oocysts and Giardia cysts were seeded into the raw water continuously during test filter runs. Plant performance was characterized by analysis of samples collected before and after filtration. After a ripening period, removals observed in the optimal runs for Cryptosporidium averaged from 2.7 to 3.1 logs, and removals for Giardia averaged from 3.1 to 3.5 logs. Includes 21 references, tables, figures.