The EV9273-70 Everpure TFC Reverse Osmosis Membrane is the B filter cartridge for Everpure reverse osmosis water filtration systems such as ROM II and ROM III. Once installed, this cartridge's carbon prefilter gets to work against the dirt, sediment, and chlorine taste and odor that can drag down the membrane's effectiveness. Afterwards, the water reaches the membrane where NSF/ANSI certified reduction down to .00001 micron occurs. Contaminants reduced in this stage include copper, fluoride, lead, nitrate, nitrite, selenium, radium, sodium, cysts, chloroform, barium, cadmium, and copper. Order today!