5 MICRON RATING: With a nominal filtration rating of 5 micron, 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: 10” x 4.5” PAC (Powdered Activated Carbon) water filters, compatible with EP-BB / 155548-43 and CB-45-1005 SpiroPure SP-EP-BB 10x4.5 CTO Coconut Shell Carbon 5 Micron Replacement Water Filter Cartridge