Make your life better with the 3M Aqua-pure 3MROM413 20A Water Filter Replacement Cartridge Module. The 3M 3MROM413-20A Cartridge is the replacement membrane for the 3MRO301, 3MRO401, and 3MRO501 Reverse Osmosis Drinking Water Systems. This semipermeable membrane provides filtration at the molecular level, filtering out almost all remaining contaminants that got through sediment and carbon pre-filtration. It reduces Lead, Mercury, Cyst, Select VOC’s2, and TDS. It offers a flow rate of 23.92 gpd and a 36-month life.