The Black Berkey Elements are a game-changer when it comes to filtering tap water and raw, freshwater sources like rivers and ponds. With the ability to address over 200 typical contaminants, you can trust that your drinking water is clean and safe. Each pair of Black Berkey Elements can filter up to 6,000 gallons of water, providing an economical and long-lasting solution for your water filtration needs. And if you need even more contaminant reduction, simply add an additional pair of elements (sold separately). Backed by independent, third-party testing, the Black Berkey Elements are the only choice for those who demand the best. Upgrade your water filtration system today and enjoy the peace of mind that comes with knowing your water is clean and pure.