Universal Reverse Osmosis RO Replacement Set of 3 filter cartridges : Sediment, GAC, CTO Carbon Block for undersink RO. 3 Pk. Size: 10"x2.5" 3 filter set plus housing wrench for free. Fit standard 10" housing. Cartridge size 10"x2.5" Third stage: premium CTO Carbon filter. Micron rating: 10. Remove: VOCs, chlorine, chloramine, First stage: 5 Micron Sediment Filter to remove dust, sand, particles etc Second stage: Premium GAC Carbon filter to remove chlorine, bad test, odor