在柯林斯堡水处理设施进行了一项中试研究，以比较现有混合介质与提议的深层双介质在递减率过滤器中的性能。在中试研究期间，根据介质水头损失、单位过滤器产量和释放的颗粒对过滤器性能进行了评估。本研究期间收集的数据表明，深床双介质过滤器的性能与现有的混合介质过滤器相当，甚至更好。该研究还表明，8.5加仑/分钟/平方英尺（gpm/sf）的相对较高初始过滤器负荷率不会影响混合介质过滤器或双介质过滤器的过滤水质。

A pilot scale study was conducted at the Fort Collins Water Treatment Facility to compare the performance of existing mixed media with proposed deep-bed dual media in declining rate filters. Filter performance during the pilot study was evaluated in terms of media head loss, unit filter production, and particles released. The data collected during this study indicate that the deep-bed dual media filters will perform as well as, or better than, the existing mixed media filters. The study also showed that a relatively high initial filter loading rate of 8.5 gallons per minute per square foot (gpm/sf) does not compromise the filtered water quality in either the mixed media filters or the dual media filters.