Water Filter Tree 50 GPD Thin Film Composite Residential Membrane for Standard RO Reverse Osmosis System Thin Film Composite (TFC) dry for longer shelf life Most trusted brand in the residential reverse osomosis membrane industry Filmtec for performance and quality This membrane can be used to replace CSM, Axeon, Dow FilmTec, GE, and any other 1812 style membranes A cost effective replacement membrane that offers consistently high quality and performanc Thin Film Composite (TFC) dry for longer shelf life