Product Features 20″ BB Sediment Filter The 5 micron sediment filter is a 100% polypropylene filter that contains graded density and provides higher dirt holding capacity than standard spun polypropylene and string wound cartridges. 20″ BB Carbon Block Filter The carbon block removes chlorine, tastes & odors and chemicals 20″ BB Matrikx Pb1 0.5 micron filter reduces lead, cysts, and heavy metals Common Size Filters Fits Big Blue 20″ filter housings. The approximate dimensions are 4.5″ x 20″.