The invention provides a porous membrane comprising PTFE blended with perfluorosulfonic acid (PFSA), wherein the membrane has a CWST of at least about 27 dynes/cm (about 27*10<-5> N/cm). A method for filtering a metal-containing fluid is provided, the method comprising passing a metal-containing fluid through the porous membrane and removes metal from the fluid. A method for filtering SPM fluid is provided, the method comprising passing an SPM fluid through the porous membrane and removes particles from the fluid.