PF-4 Fluoride and Arsenic Reduction Filters absorb the following unwanted elements found in drinking water: Fluoride, Arsenic, Lead, Heavy Metal, Ions, MTBE (Methyl-tertiary-butyl-ether), Trihalomethanes (THM), DBCP (Dibromo-chloro-propane), Herbicides and Pesticides.
They are made from safe, non-leaching Polypropolene #5 that is BPA-free. They are sold in a set of 2.
PF-4 Fluoride and Arsenic Reduction Filters are designed to be used in conjunction with the Berkey Earth Elements.
They attach to the bottom of the Berkey Earth Elements and sit in the lower chamber of the Berkey unit.
The number of PF-4s in the bottom chamber must match the number of Berkey Earth Elements in the top chamber; for example, 2 Berkey Earth Elements would require 2 PF-4 Filters.
PF-4 Filters need replacement after six months.