CELLTREAT Scientific Products 500mL, 0.45¿m PES Filter System. Easy-to-read molded graduations marks on bottle top filter. Bold easy-to-read printed membrane and pore size for easy identification. Curved bottle design for easy handling. Printed lot number and expiration date on every bottle top. Improved filter support provides faster flow rates. Angled hose barb adapter fits three size hose diameters and prevents the filter from tipping. Polyethersulfone (PES) membrane is for high flow and low binding. 0.45¿m PES membrane ideal for solution clarification. Filter Systems include bottle top filter and solution bottle with cap. Large diameter filter increases flow and prevents clogging. Membrane diameter of 75mm. Every case is printed with the lot number for quality traceability. Packaged sterile, individually bagged, 12/case.