The Black Berkey® Filters BB9-2 Authentic Cartridge is a set of two replacement filter cartridges designed for Berkey water purification systems. Made with carbon(charcoal) material, these cartridges are suitable for both commercial and household use. The black color and Berkey brand make it easy to identify and ensure compatibility with your filtration system. With a filtration method of carbon(charcoal), these cartridges effectively remove impurities from your water for a clean and safe drinking experience. Made in the United States, these authentic Berkey cartridges are a reliable choice for maintaining your water purification system.