10 MICRON RATING: With a nominal filtration rating of 10 micron, our quality NSF Carbon filter reduces fine sediment particles and chlorine taste & odor from tap water 20x4.5 NOMINAL: 20” BB 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 EPM-20BB / 155783-43, CB-45-2010 and other 20” x 4.5” PAC (Powdered Activated Carbon) water filters SpiroPure SP-EPM-20BB 20x4.5 CTO Coconut Shell Carbon 10 Micron Replacement Water Filter Cartridge