Orku Fluoride Reduction Filter K5366 - Compatible with Berkey PF-2Orku Fluoride Reduction Filters K5366 are designed to support gravity water filtration systems by helping reduce fluoride, arsenic and other trace elements commonly present in tap water. Using carbonate apatite media, these filters act as a secondary filtration stage when used alongside compatible carbon filters. Designed for use with gravity benchtop systems, the K5366 filter helps improve overall water quality as part of a multi stage filtration