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. 0.45µm PES membrane ideal for solution clarification. Filter Systems include bottle top filter and solution bottle with cap.