Product Description Pentair OMNIFilter PB55-20 Carbon Water Filter, 20-Inch, Whole House Premium Heavy Duty Carbon Block Lead Reduction Replacement Cartridge, 20″ x 4.5″, 0.5 Micron. Premium Carbon Block Filter designed to protect your family from Lead and Cysts at every tap in your home for safer, better-tasting water. Fits All 20″ Heavy Duty Housing and can replace any 20″ x 4.5 carbon filter cartridge. Unique CARTRIDGE DESIGN provides professional-level lead reduction with the highest flow rate and the lowest pressure drop available in the industry. NSF INTERNATIONAL STANDARD 53 CERTIFIED for the reduction of Lead and Cysts when used in the Pentair OMNIFilter BF35-S-S18 filter housing or PB35-S-S18 filter system. 40,000 GALLON CAPACITY. Replace every 4-5 months or when you notice a drop in water pressure or water quality. B00U3OR9IO OMNIFilter RS1 Pleated Sediment Filter. OMNIFilter RS12 String Wound Sediment Filter. OMNIFilter RS14 Poly Sediment Filter. OMNIFilter RS7 String Wound Sediment Filter. OMNIFilter RS19 Reusable Sediment Pre Filter. OMNIFilter DFX-CB-10 Diamond Flow Carbon Filter Cartridge Size. 10″ x 2.5″. 10″ x 2.5″ Filtering Microns. B09QY559N7 OMNIFilter CB3 Carbon Block Filter. OMNIFilter TO1 Carbon Filter. OMNIFilter GAC1 GAC Carbon Filter. OMNIFilter TO3 Carbon Filter. OMNIFilter CB1 Carbon Block Filter. OMNIFilter CB7 Carbon Block Filter Cartridge Size. B00965Y4HK OMNIFilter Whole House System. OMNIFilter Dual Stage Undersink Filtration System. OMNIFilter Heavy Duty Whole House Filtration System. OMNIFilter Single Stage Undersink Filtration System. OMNIFilter Heavy Duty Premium Whole House Filtration System. OMNIFilter Premium Whole House System B003637T7U. B007X7PNO6 OMNIFilter RS22 Pleated Sediment Filter. OMNIFilter RS15 Pleated Sediment Filter. OMNIFilter RS16 Poly Sediment Filter. OMNIFilter RS18 Poly Sediment Filter. OMNIFilter RS22 String Wound Sediment Filter. OMNIFilter TO6 Pleated Carbon Filter Cartridge Size. 10″ x 4.5″. 10″ x 4.5″ Filtering Microns. B007X7PPVW OMNIFilter TO8 Carbon Filter. OMNIFilter RO6 Carbon Iron Reduction Filter. OMNIFilter CB6 Carbon Block Filter. OMNIFilter OM36KCS Cabinet Water Softener with Demand Regeneration. OMNIFilter OM34K Tank Water Softener with Demand Regeneration. OMNIFilter R200 Inline Water Filter Cartridge Size. About this item PREMIUM CARBON BLOCK FILTER designed to protect your family from Lead and Cysts at every tap in your home for safer, better-tasting water FITS ALL 20″ Heavy Duty Housing and can replace any 20″ x 4.5 carbon filter cartridge UNIQUE CARTRIDGE DESIGN provides professional-level lead reduction with the highest flow rate and the lowest pressure drop available in the industry NSF INTERNATIONAL STANDARD 53 CERTIFIED for the reduction of Lead and Cysts when used in the Pentair OMNIFilter BF55-S-S18 filter housing or PB55-S-S18 filter system 40,000 GALLON CAPACITY. 3—Sometimes we may send small gift for you, please keep it if you get some gift from us. And hope you like it. Anyway, thanks so much, enjoy shopping.