SpiroPure PAC series solid block carbon filters are composed of NSF-certified coconut shell PAC (powder activated carbon) and encompass a few series of filters, including SP-CB, SP-EP, and SP-EPM series SpiroPure carbon filters. A high dirt holding capacity along with a high porosity that maintains a low pressure drop made these cartridges the perfect choice for a wide range of applications such as residential, food service, commercial, and industrial water filtration.