VEVOR Whole House Water Filter Replacement Cartridge, 4.5"x20"(11x51cm) Polyphosphate Scale Inhibitor Filter for Whole Home Filtration System, Reduce Chlorine, Taste, Odor, Prevent Corrosion

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KDF media is an extremely heavy copper-zinc alloy; a full 20-inch cartridge would weigh over 50 lbs, risking damage to plastic housings. It is typically sold as a layered component inside GAC (Granular Activated Carbon) cartridges to extend the life of the carbon and kill bacteria. Most whole-house KDF applications use large tank systems rather than small cartridges to prevent the heavy media from clumping or "channeling."