Whatman ® GD/X syringe filters glass microfiber membrane, pore size 0.45 μm, diam. 13 mm, non-sterile, pk of 150 ea pricing WHA68942504 Whatman ® GD/X syringe filters glass microfiber membran, pore size 0.45 μm, diam. 25 mm, non-sterile, pk of 150 ea