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3 Stage Big Blue Filter Kit 4.5' x 20' Sediment, Bone Char, Radial Flow Carbon: Home Improvement. 3 Stage Big Blue Filter Kit 4.5" x 20" Sediment, Bone Char, Radial Flow Carbon: Home Improvement. Country Of Origin: United States 。 Number Of Items: 1 。 From The Brand: Afwfilters 。 Color: White 。 20" BB Sediment Filter The 5 micron sediment filter is a 100% polypropylene filter contains graded density that provides higher dirt holding capacity than standard spun polypropylene and string wound cartridges. 20" BB Bone Char Bone char filter reduces fluoride and arsenic in your water along with a wide range of radioactive particles, tastes, and odors. 20" BB Radial Flow Carbon Carbon filter for chlorine, tastes, and odors with radial flow design for minimal flow restriction. System Upgrade This filter set can be used as an upgrade to your current 20" big blue system. Common Size Filters Fits Big Blue 20" filter housings. The approximate dimensions are 4.5" x 20". Replacement filter set for the 3 stage Big Blue 20" filter system includes sediment, bone char carbon and radial flow carbon filters. Sediment filter reduces dirt, sand, and particulates. The bone char filter reduces fluoride and arsenic in your water along with a wide range of radioactive particles, tastes, and odors.. The radial flow carbon filter reduces chlorine, tastes, odors, and chemicals with minimal flow restriction. 。 。 。