Berkey Vs The EPA EPA in an attempt to regulate gravity fed water filters reclassified Berkey’s Black Berkey elements as pesticides ( The EPA’s definition of “pesticides” are substances or mixtures of substances that are intended to prevent, destroy, repel, or mitigate pests.) and the EPA’s definition of Pest is "(1) any insect , rodent, nematode, fungus, weed, or (2) any other form of terrestrial or aquatic plant or animal life or virus, bacteria, or other micro-organism
