The Polyphosphate/Granular Activated Carbon Cartridges utilize 42, NSF 60 certified clear bead media for scale and corrosion reduction. Also, iron is sequestered, preventing precipitation thus greatly improving the performance of the effluent water. The black granular coconut shell activated carbon is excellent for the removal of organic contaminants and chlorine. This is a superior multipurpose filter cartridge Phosphates are a preferred food for bacteria and should not be used -chlorinated feed water without any bacterial protection (example: UV light, KDF, ceramic filters). Removes: Chlorine Bad Taste Odor Turbidity THMs Organic Contaminants Dirt Sediment Specifications: Micron Rating: 10 Nominal Dimensions: 20" x 4.5" Total Weight: 6 lb 4 oz 2 lb of Slow Dissolve Phosphate 4 lb of Coconut Shell Carbon Operation Temperature: 40F to 100F Max Recommended Flow Rate: 4 GPM Filter Media: Polyphosphate Filter Life: 12,000 Gallons