0.5 MICRON RATING: With a nominal filtration rating of 0.5 microns, our quality NSF Carbon filter reduces fine sediment particles and chlorine taste & odor from tap water 10x4.5 NOMINAL: 10” 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 CBC-BB / 155170-43 FloPlus-10BB / 455905-43, SMCB-4510 and other 10” x 4.5” PAC (Powdered Activated Carbon) water filters SpiroPure SP-CBR2-BB 10x4.5 CTO Coconut Shell Carbon 0.5 Micron Replacement Water Filter Cartridge