2 Year - 5 Stage Reverse Osmosis Water Filter Kit for w/50 GPD Membrane (15 pcs replacement set) 2 years supply of filters w/ 1 Membrane 5 Stage Reverse Osmosis Water Filters systems Replacement filters and membrane Filter Size: 2.5" X 9.75" | Fits most standard 10" Housing 4PCS Sediment Filter, 4PCS GAC Block, 4PCS Carbon Block, 1 Membrane & 2 Inline Carbon Filters