实验室规模的测试调查了硅藻土（DE）过滤提供的隐孢子虫卵囊减少程度。试验中使用了两个制造商生产的三个等级的DE。使用沃尔顿试验过滤器上的种子河水测量减少量。测试的过滤速率为1和2 gpm/sq ft（2.4和4.9 m/h）。每次重复三次，质量控制严格。在常规操作条件下，使用渗透性为<1的DE级，隐孢子虫卵囊浓度预计会降低约6个对数。 2.达西。根据DE品位的渗透率和过滤速率，原木减少量可预测地发生变化；在较高的过滤速率下，它们显著更高。两次试验之间的一致性非常好，使研究人员能够以一致的统计学显著性区分性能差异。包括14个参考文献、表格和图表。

Laboratory scale testing investigated the degree of Cryptosporidium oocyst reduction provided by diatomaceous earth (DE) filtration. Three grades of DE from two manufacturers were used in the tests. Reduction was measured using seeded river water applied to Walton test filters. Tests were run for filtration rates of 1 and 2 gpm/sq ft (2.4 and 4.9 m/h). Each run was replicated three times, and quality control was rigorous. Approximately 6 logs of reduction in the concentration of Cryptosporidium oocysts can be expected under routine operating conditions using DE grades having permeability of <1.2 Darcy. Log reductions varied predictably according to the permeability of the DE grade and the filtration rate; they were significantly higher at the higher filtration rate. Agreement was excellent between runs, enabling researchers to distinguish with consistent statistical significance the differences in performance. Includes 14 references, tables, figures.