The Black Berkey® Filters BB9-2 Authentic Cartridge is a high-quality replacement filter cartridge designed for Berkey systems. Made of carbon/charcoal, this black filter cartridge is suitable for both commercial and household use. With a filtration method of carbon/charcoal, it can filter out impurities and contaminants to provide clean and safe drinking water. This includes 2 cartridges for your Berkey system. Made in the United States by Berkey, this genuine cartridge ensures a perfect fit and reliable filtration performance.