polypropylene housing 0.2 um ptfe syringe filter for fertilizers Whatman Puradisc 25 mm PES Syringe Filters, 0.2 µm, 1000 Pack Whatman brand Puradisc syringe filters, PES, 25 mm diameter, 0.2 µm pore size, polypropylene housing, luer inlet/outlet connectors, 6794-2512, 1000 pack Whatman Puradisc 25 mm PES Syringe Filters, 0.2 µm, 1000 Pack