The 3MROM413-20A 3M Under Sink Reverse Osmosis Membrane Replacement Water Filter is a reverse osmosis membrane replacement which provides filtration at the molecular level. The 3MROM413 can reduce levels of chlorine taste and odor, lead, and particulates. This filter features a slim profile design that allows for minimal space requirements and allows for more space beneath your sink. Easy operation and installation mean that replacing this filter and maintaining your system is a breeze. Quick change cartridge design means no hassle with tools and other appliances. The 3MROM413 is a replacement membrane for the 3MRO401 and 3MRO501 reverse osmosis systems.