1 set of replacement filters with following : 16 x CTO Carbon Block Filter Carbon Block Filter – Size 2.5 inch x 19 7/8 inch 5 Micron nominal filter remove small particles and carbon fines may pass from second stage & to ensure 100% of chlorine removal from water. All filters are individually wrapped. Total 16 filters, each individually wrapped. This Filter pack available with different pack 1 pack 323542016026 4 pack 203922748607 12 pack 203922753622