Pentair OMNIFilter TO8 Carbon Water Filter, 10" Heavy Duty Whole House Granular Carbon Taste & Odor Replacement Filter Cartridge, 10" x 4.5", 25 Micron. Effective reduction of chlorine taste & odor, sand, dirt, sediment and rust particles for great-tasting, clean water from every tap in your house. Fits the OMNIFilter BF7, BF9C, BF35, BF36C filter housing as well as 10" heavy duty housings of other major brands; can replace any 10" x 4.5" heavy duty carbon filter cartridge. Granular activated carbon cartridge with radial flow design for high flow rate and low pressure drop. 50% more capacity and cartridge life than traditional heavy-duty whole house filters. 40,000 Gallon Capacity. Replace every 3 months or when you notice a drop in water pressure or water quality.