The rhino pro filter is constructed from australian mined rc412 carbon the best in the world the carbon is tightly packed and sealed into a high efficiency airflow cylinder with a vortex cone in the base and a custom pore surface for maximum transference the high porosity carbon and lightweight aluminium make the rhino filter smaller and easier to handle how long will a rhino pro filter last unlike all other carbon filters with effective life spans of 9 to 18 months rhino filters have alw