Berkey® purifiers are the fastest-producing gravity-fed water purification systems on the market, with purification elements that remove a broad universe of contaminants.Berkey® systems equipped with Black Berkey® Purification Elements remove greater than 99.999% of viruses and greater than 99.9999% of pathogenic bacteria, while also removing or dramatically reducing protozoa, trihalomethanes, inorganic minerals, heavy metals, pharmaceuticals, pesticides, VOCs, petroleum products, perfluorinated chemicals, rust, silt, sediment and radiologicals.