The Frontier Emergency Water Filter System is ideal for hiking, travel, and emergency preparedness. It is the perfect addition to your 72 hour emergency kit. One unit will filter up to 30 gallons of water. The Frontier Filter is tested and certified to remove >99.9% of Cryptosporidium and Giardia. The Frontier Emergency Water Filter System is also easy to operate, just attach and expand the straw, submerge the filter end into the water source, and drink through the straw. Ultra light and compact, the Frontier Emergency Filter System weighs less than one ounce and easily slips into a day pack, shirt pocket or travel luggage and is always ready when you need it. The Filter is the ideal alternative to heavy, bulky and expensive pump filtration units when space and weight are primary factors. Activated coconut shell carbon helps reduce waterborne chemicals, improves water taste and eliminates odors. Use the Water Filter Straw to drink from any bottle, cup or directly from water sources.