KX Technologies - FXB20CL2 - 20" x 4.5" Filtrex Ecocarb GreenBlock CL2 - 10 Micron - Carbon Block Chlorine FilterThe KX Technologies FXB20CL2 Filtrex Ecocarb GreenBlock delivers NSF certified chlorine, taste, and odor reduction using high performance coconut shell carbon in a 20" x 4. 5" format built for whole house and commercial applications. This 10 micron carbon block filter handles up to 7 gpm with exceptional dirt holding capacity and a 34,000 gallon service life, all while reducing greenhouse gas emissions through KX's patented greencarbon manufacturing