The Series II Green Line replaceable filter removes greater than 99.9999 percent of bacteria, Cryptosporidium, Giardia, chlorine, bad tastes and odors. When heading abroad or to areas prone to virus, the Red II Red Line replaceable filter offers added virus protection. With a great flow rate (500 ml/minute) of any water filter bottle on the market and an ergonomic design, gaining access to clean drinking water has never been so easy. When you meed more than just great tasting drinking water, turn to the redesigned Frontier Filtered Water Bottle by Aquamira. Aquamira is passionate about water and great at innovative technology. A leader in water treatment systems and purification products. Aquamira provides easy, safe drinking water anywhere.