Make sure this fitsby entering your model number. POWERFUL PURIFICATION- Berkey systems equipped with Black Berkey Purification Elements purify waterâ€”not just filter itâ€”by addressing over 200+ contaminants in tap water or raw, untreated freshwater sources like ponds, rivers and streams. ECONOMICAL, LONG-LASTING- A pair of Black Berkey Purification Elements lasts for up to 6,000 gallons before needing replacement. Each additional pair of elements (sold separately) adds an additional 6,000 gallons of purification power to your system. Elements not for use with saltwater sources or softened water. INDEPENDENT TESTING- Berkey by NMCL uses several independent third-party labs to test a broad range of potential contaminants, and has conducted Extreme Testing for lead and PFCs in order to show the effectiveness of our Black Berkey Purification Elements. AMERICAN PRODUCT- Black Berkey Purification Elements are made and assembled in the USA.