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WF-CB101, NSF certified, 2.5-inch x 9-3/4-inch Activated Carbon Block Water Filter Cartridge, fits in 10-inch standard size housings of undersink reverse osmosis (RO) or water filtration systems. Our filter cartridges remove chlorine, chloramine, color, odor and other suspended particles up to 1 micron in municipal and portable water to increase quality. Recommended replacement time is 8-12 months depends on the quality of the original water source. Made with 100% Coconut shell carbon. Certified NSF ANSI 42 Standard, Chlorine Capacity: 6,000 gallons, Micron Rating: 1 Micron Available in different packing quantities.