The Survival Straw is a unique solution for water purification. By drinking through the Survival Straw, you destroy harmful bacteria, remove chlorine, water-soluble heavy metals, pesticides, arsenic, mercury, EDB, and other carcinogens. Odor and bad taste are also eliminated as the water is purified. Certified tests show that the Survival Straw will remove 99.99% of bacteria, Giardia, and EDB pesticides from your water source. The Survival Straw weighs only two ounces and is 1 1/4 " in diameter by 7 1/2 " long. Processes up to 5,000 gallons of water.