KX Matrikx Sort By Default Title - A to Z Title - Z to A Price - lowest first Price - highest first Time Added - latest first Popularity - most popular first Sales - best selling first $23.91 $23.91 View... KX Matrikx Pb1 10" x 2.5" 0.5 Micron Carbon Block Water Filter Replacement Cartridge 06-250-125-975 $10.32 $10.32 View... KX Matrikx CTO 10" x 2.5" 5 Micron Carbon Block Water Filter Replacement Cartridge 32-250-10-GREEN $64.38 $64.38 View... KX MATRIKX Pbi 06-450-10-GREEN Carbon Block 10" x 4.5" 0.5 Micron Whole of House Water Filter Cartridge $129.38 $129.38 View... KX MATRIKX Pbi 06-450-20-GREEN Carbon Block 20" x 4.5" 0.5 Micron Whole of House Water Filter Cartridge $47.20 $47.20 View... KX MATRIKX CTO 32-450-10-GREEN Carbon Block 10" x 4.5" 5 Micron Whole of House Water Filter Cartridge $84.09 $84.09 View... KX MATRIKX CTO 32-450-20-GREEN Carbon Block 20" x 4.5" 5 Micron Whole of House Water Filter Cartridge