Whatman 6870-2502 GD/X 25 mm Syringe Filter, Nylon Membrane, 0.2 um, 150-pk. MSRP: Now: $695.00. Was: Whatman 6870-2502 GD/X 25 mm Syringe Filter, Nylon Membrane, 0.2 um, 150-pk Cytiva's Whatman™ Non-Sterile GD/X Syringe Filters. The GD/X range is specifically designed for filtration of high particulate loaded samples.