Berkey Water Filters Ceramic Berkey Earth Filters - includes one pair of (2) White Ceramic Filters Berkey Earth Pair of Nine-inch filter elements fit majority of gravity filter systems Each element will filter up to 3,000 gallons of water or last up to 3 years,whichever comes first before a replacement is needed Compatible withPF-4 Fluoride and Arsenic Reduction Filters / No Priming Required! Micro-Filtration Technology. Tested to reduce contaminants tobacteriallevel Proprietary formula comprised of Diatomaceous Earth, granulated activated carbon and other media components, designed to exceed filtration standards