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HydroLogic® KDF/Catalytic Carbon Upgrade Filters are advanced carbon block pre-filters effective in capturing water-soluble metals, chlorine, chloramines and scale. The carbon media is more porous than coco carbon providing a wider range of filtration. Replacement should be performed when inlet pressure and outlet pressure difference is greater than 10%. NOTE: Systems come standard with HydroLogic® Green Coconut Carbon Filters. The HydroLogic® KDF/Catalytic Carbon Filters are an upgrade option. For Stealth-RO™ and smallBoy® Systems Replace every 2,000 Gallons for Stealth-RO Systems Replace every 6,000 Gallons for smallBoy® Systems Dimensions: 10.5in x 4.5in
