本研究的主要目的是获得关于不同过滤介质去除囊肿和卵囊的相对有效性的信息。本研究的其他目标是确定不同过滤介质的绝对去除效率；评估需氧内孢子、颗粒计数、浊度和聚苯乙烯珠作为去除囊肿和卵囊的替代物的潜在适用性；并评估此类研究的再现性。用于实现这些目标的方法是将热灭活、抗体保存的小鼠贾第虫囊肿和微小隐孢子虫卵囊刺入进水中进行试验- 缩放过滤器。其中三个过滤器充满了颗粒介质，其中一个过滤器是空的。对进水和出水样本进行原生动物、浊度、颗粒计数和内孢子分析。聚苯乙烯珠的去除也在一次运行中进行了检查。在冬季条件下研究了三次相同的运行，在夏季条件下研究了三次相同的运行。

The primary objective of this study was to gain information about the relative effectiveness of different filtration media for the removal of cysts and oocysts. The additional objectives of this study are to determine the absolute removal efficiencies for the different filtration media; to evaluate the potential applicability of aerobic endospores, particle counts, turbidity, and polystyrene beads for use as surrogates for cyst and oocyst removal; and, to assess the reproducibility of such studies. The approach used to accomplish these objectives was to spike heat inactivated, antibody preserved Giardia muris cysts and Cryptosporidium parvum oocysts into influent water to pilot-scale filters. Three of the filters were filled with granular media and one of the filters was empty. Influent and effluent samples were analyzed for protozoa, turbidity, particle counts, and endospores. The removal of polystyrene beads was also examined in one run. Three identical runs were studied under winter conditions, and three identical runs were examined under summer conditions.