Pricing. HVWP047S6. PVDF, pore size 0.45 μm, filter diam. 47 mm, white plain sterile membranes for microbiological analysis. Pricing. HCWG047S6. mixed cellulose esters (MCE), pore size 0.7 μm, filter diam. 47 mm, white gridded membranes for microbiological analysis of wastewater.