Additional Details ------------------------------ Product description: Pura 41407011 Annual Filter Replacement Kit for QCRO. Pura 41407011 Annual Filter Replacement Kit for QCRO The includes all of the replacement pre and post filters needed to keep your QCRO 4 Stage Quick Change Reverse Osmosis System running for an entire year. The kit includes two sediment pre filters two carbon block pre filters and one carbon block postfilter. The pre filters should be replaced every 6 months the post filter every 12 months. Complete set of pre and post filters Includes two 41407001 sediment prefilters Includes three 41407002 carbon block filters Replace pre filters every 6 months post filter every 12 months PURA QCRO 4 Stage Quick Change RO System Specifications PURA QCRO 4 Stage Quick Change RO System Manual PURA QCRO Performance Data Sheet Reverse Osmosis Systems Pura QCRO and QCUF Replacement Filters