Pentek WP-5 polypropylene string wound 5-micron pre-filter removes sediment, rust and other microscopic debris Pentek CFB-Plus10 Fibredyne 5-micron solid carbon block cartridge and 0.5 micron Pentek CBC-10 carbon block filter remove chlorine, chloramine, bad tastes and odors, pesticides and carcinogenic impurities Pentair encapsulated TFC reverse osmosis membrane removes up to 99% of water contaminants like lead, nitrate, fluoride and mercury, even in high TDS water Pentek GS-10RO granular activated in-line post-filter polishes the water to crystal clear perfection