Perfect for emergency kits, foreign travel, backcountry, and outdoor activities, the Aquamira Frontier Emergency Water Filter System is one of the smallest, lightest, and simplest water filters available. . Tested and certified to effectively remove 99.9% of protozoan cysts, including both Giardia and Cryptosporidium. Ultralight, compact unit weighs less than 1 oz. and is less than 5 in. long easily fits into any pack, luggage, or emergency kit. Simple to use just attach and expand the straw, submerge the filter end into the water source, and drink through the straw can be used to drink from any bottle, cup, or water source. Proprietary blend of microscopic carbon, binder, and antimicrobial particles are sintered to create a highly porous, carbon impregnated filter block with a tightly controlled pore structure to remove contaminants. Activated coconut shell carbon helps reduce waterborne chemicals, improves water taste, and eliminates odors. Each filter is good for 20 30 gal. 75 110 L of water. Use with Aquamira Water Purifier Tablets or Water Treatment Drops for a complete water treatment system.