CRYSTAL QUEST 2-7/8" x 20" 5-Micron Carbon Block Filter Cartridge CRYSTAL QUEST Carbon Block simultaneously removes chlorine taste and odor, and organic chemicals that contribute to taste and odor, while providing the particulate filtration and dirt-holding capacity of an efficient 5µm nominal sediment filter. The extrusion process allows the production of a carbon block with more carbon, but a lower pressure drop. CRYSTAL QUEST Carbon Block filters deliver extended life while removing sediment, chlorine taste and odor, and organic contaminants from water, aqueous solutions or suspensions. The CRYSTAL QUEST Carbon Block is also widely used in filtering organic solvents.