Membrane Filters, 0.10um, 0.22um, 47MM. Shop By. Clear All. Whatman’s range of membrane filters with advanced technical specifications are the preferred choice for a wide range of applications. The membrane filters offer accurately controlled pore size distribution and higher strength and flexibility, which ensure reproducibility and consistency. Tisch Scientific supplies competitively-priced Whatman membrane filters, including PTFE Filters, PVDF Membrane Filters, Nylon Membrane Filters,