Carbon Cartridges use activated carbon and other activated materials to reduce contaminants from water. Mostly carbon cartridge use mechanical filtration as well both sediment, chemicals remove. Carbon black cartridges are used for the filtration of water, spirits and organic solvents. These are used for removal of color, smell and taste Technical Specifications: Material : Activated carbon Size : 10 & 20 Cap : Black end cap style Outer Diameter : 2.5 & 4