Reverse Osmosis Replacement Filter Set RO Cartridges 15 pcs w/ 100 GPD Membrane 12 Piece Filter set for a Standard Size Reverse Osmosis System All our filters individually wrapped for freshness and protection while in shipment. 4 Sediment Filters 4 GAC Carbon Filters 4 Carbon Block Filters 2 GAC Carbon Post Filters 1 High Flow 100 Gallon per Day Membrane