Berkey Water Filters are the world’s most powerful and cost effective personal water purification systems as verified by independent testing. Whether you buy a Berkey Light, Travel, Big, Royal, Imperial, or Crown System they all work with our industry leading Black Element Filters using a proprietary formula of over 6 different filter media types. Our filters are gravity fed and will purify water from bacteria, viruses, chlorine, pesticides, herbicides and other harmful toxins. Each durable Black Berkey Water filter will last up to 3000 gallons (6000 gallons per set of 2). This is much longer than most filter solutions on the market.