Berkey water filters use a multi-stage purification process, including microfiltration, adsorption/absorption, and ion exchange, to effectively remove zinc and other contaminants from water. The Black Berkey Filters, which are the most commonly used in Berkey systems, are made of materials, with a unique shape and texture, that help prevent contaminants from passing through. Independent lab tests have confirmed that Berkey filters are capable of removing at least 99.9% of zinc from water.