Cheap And Discounts 100pcs/lot Polypropylene Microporous Filter Membrane 200mm/300mm Lab PP Membrane 0.22/0.45/0.8/1/1.2/5/10/20um Wholesale. Buy Directly From Merchant Xin Tester Factory Store Store. Enjoy ✓Free Shipping Worldwide! ✓90 Days Buyer Protection. ✓Easy Return. ✓Money Back Guarantee.