Cheap And Discounts Microporous Filter Membranes Hydrophilic PVDF 25 47 50 60 90 100mmPore Size 0.22 0.45um Micro Membrane Filter 50 Circles Wholesale. Buy Directly From Merchant Lab Supplies. Enjoy ✓Free Shipping Worldwide! ✓90 Days Buyer Protection. ✓Easy Return. ✓Money Back Guarantee.