NSF Certification and online listing PENDING Phoenix Gravity New Millennium Edition™ Filter Elements are designed to fit all Berkey® water systems, including Go Berkey® Kit, Travel Berkey® , Berkey Light, Big Berkey® , Royal Berkey® , Imperial Berkey® , and Crown Berkey™ systems, plus most other brands of gravity-fed water filter systems. New BB9 Black Berkey Filter Element alternative filter element from Phoenix Gravity Installed in Upper Chamber of Berkey System Replacing Black Berkey Filters Certified by NSF International for NSF/ANSI Standards 42 and 372. (NSF Certification and online listing PENDING) Phoenix Gravity New Millennium Edition™ Filter Elements are manufactured for New Millennium Concepts, Ltd., as economical replacement filters in lieu of Black Berkey® Elements for use in Berkey® gravity-fed water filter systems and other brands of gravity-fed water filter systems. We recommend replacing Phoenix Gravity New Millennium Edition™ Filter Elements every 2,750 gallons (20800 litres / 5,500 gallons per set of 2 elements). Elements may require replacement sooner based upon the quality of influent water. Recommended filter replacement is yearly Warranty: One year from the date of receipt Compatible with Berkey PF-2® Fluoride and Arsenic Reduction Elements in the lower chamber. Includes: two Phoenix Gravity New Millennium Edition™ Filter Elements with two washers, two wing nuts, PrimeEasy™ Universal Primer, two vials of red food coloring and product instruction sheet.