The Aquamira Frontier Straw Filter is a small, lightweight method to keep you hydrated, even in the worst scenarios. Weighing under an ounce, the Frontier Straw can be easily added to any pack, bugout or get home bag. Certified to filter 30 gallons of water with a flow rate of up to 450 ml/min, you can hydrate at any fast moving stream or backcountry water source with ease. Activated coconut shell carbon removes 99.9% of Cryptosporidium and Giardia cysts, while reducing chlorine, chemicals, taste, clarity and odor.