Black Purification Filter Elements (BB9-2) for Berkey Gravity Water Systems

BB9 BLACK PURIFICATION FILTERS (PAIR). FOR BERKEY WATER FILTERS. The number ofPF-2 's must correspond with the number ofBlack Purification Filters put in the upper chamber. For example,4 Black Purification Filters (2 sets of 2) would require 4PF-2' s.

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