Ready-to-use, preassembled filter cartridges that install in seconds. Helps create crystal-clear, healthy water. Dual-sided replaceable dense-floss cartridges contain more activated carbon to remove toxic impurities, odors and discoloration Cartridges should be replaced when water begins to enter the filter and bypass and/or the cartridge becomes clogged. Cartridges should be changed every 4-6 weeks
