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 $45.39 $45.39 View... KX MATRIKX CTO 32-450-10-GREEN Carbon Block 10" x 4.5" 5 Micron Whole of House Water Filter Cartridge $10.35 $10.35 View... KX Matrikx CTO 10" x 2.5" 5 Micron Carbon Block Water Filter Replacement Cartridge 32-250-10-GREEN $64.57 $64.57 View... KX MATRIKX Pbi 06-450-10-GREEN Carbon Block 10" x 4.5" 0.5 Micron Whole of House Water Filter Cartridge $84.33 $84.33 View... KX MATRIKX CTO 32-450-20-GREEN Carbon Block 20" x 4.5" 5 Micron Whole of House Water Filter Cartridge $116.78 $116.78 View... KX MATRIKX Pbi 06-450-20-GREEN Carbon Block 20" x 4.5" 0.5 Micron Whole of House Water Filter Cartridge $23.98 $23.98 View... KX Matrikx Pb1 10" x 2.5" 0.5 Micron Carbon Block Water Filter Replacement Cartridge 06-250-125-975