Removal Capabilities: Woder WD-20M-REP Cartridge. 20 Micron Sediment, Dust, Dirt and Contaminants removal cartridge. The WD-20M-REP is a single stage replacement cartridge for: Woder WD-20M-DC Water Filter. Woder WD-20M-JG Water Filter. The WD-20M-REP is the first stage replacement cartridge for the following dual stage systems: Woder WD-D-20M-ADV-DC Water Filtration System. Woder WD-D-20M-ADV-JG Water Filtration System. Cartridge lifespan: 1 year under warranty. Selective Filtration™ Our proprietary Selective Filtration™ technology removes 99.9% of contaminants while leaving in all essential minerals. Reverse Osmosis (RO) filters also remove 99.9% of contaminants, however, RO also remove ALL the minerals found in tap water – including minerals your body needs. RO systems can waste thousands of gallons of water annually while flushing out contaminants down the drain.