Nylon Membrane Filters Diameter 47 mm Pore Size 0.22 μm Laboratory Filtration Membrane by Allpure Biotechnology [Pack of 100] (Nylon, 0.22 um) Misc. $35.98. $35. . 98 ($3.60/10 Items) Get it as soon as Wed, Jun 30. FREE Shipping by Amazon. Only 1 left in stock - order soon.