Berkey PF-2 Fluoride and Arsenic Reduction Elements The PF-2 Fluoride and Arsenic Reduction Filters are made and assembled in the USA The Berkey PF-2 Fluoride and Arsenic Reduction Elements adsorb the following unwanted elements found in drinking water: Fluoride: Sodium Fluoride, Sodium Fluorosilicate, Fluorosilicic Acid (aka Hydrofluorosilic Acid) Arsenic: V and pre-oxidized Arsenic III Other residual heavy metal ions Made from safe, non-leaching Polypropolene #5 that is BPA-free Sold in a set of 2 Berkey PF-2 Fluoride and Arsenic Reduction Elements are designed to be used in conjunction with the Black Berkey Purification Elements. Only Attach to the bottom of the Black Berkey Purification Elements and sit in the lower chamber of the Berkey unit Number of Berkey PF-2 Elements in the bottom chamber must match the number of Black Berkey Purification Elements in the top chamber; for example, 4 Black Berkey Purification Elements would require 4 PF-2 Filters Set of 2 Berkey PF-2 Elements need replacement after 1000 gallons of use The Berkey PF-2 Fluoride and Arsenic Reduction Elements are covered under a six month warranty