10 MICRON RATING: With a nominal filtration rating of 10 microns, our quality NSF Carbon filter reduces fine sediment particles and chlorine taste & odor from tap water 30x2.5 NOMINAL: 30” filter made with CTO coconut shell carbon filter media NSF CERTIFIED: This filter cartridge is tested and certified by NSF International to NSF/ANSI Standard 42 for material requirements only QUALITY REPLACEMENT: Comparable to CFB-30 / 255673-43 and other 30” x 2.5” PAC (Powdered Activated Carbon) water filters SpiroPure SP-EPM-30 30x2.5 CTO Coconut Shell Carbon 10 Micron Replacement Water Filter Cartridge