OMNIFilter OM1-S2-S06 Drop-in Reverse Osmosis Replacement Cartridge Replacement RO membrane for reverse osmosis systems Reduces TDS (total dissolved solids), Cryptosporidium and Giardia cysts, barium, cadmium, chromium, copper, fluoride, lead and radium Flow rate of 15 gallons per day For use with most undersink reverse osmosis drink water filter systems Fits OMNIFilter RO2000 and RO2050 systems and other major brands