DuPont DUPONT-WFROM1000X Quicktwist Reverse Osmosis Membrane Fits DuPont 3-stage reverse osmosis drinking water filtration system Reverse osmosis water filtration membrane is certified to reduce 90% of total dissolved solids, lead and pentavalent arsenic Quick twist change system with auto shut-off for easy replacement 1/4 turn rapid change system enables replacement with no mess Lasts up to 12 months