CO-Z Army Green Camping Water Filter Life Emergency Straw - 99.9999% Water Purification Filters up to 700 liters (185 gallons) of water. Reduces turbidity by filtering down to 15 microns. Removes 99.9999% of waterborne bacteria, protozoan parasites and particles. Lightweight and portable (only 7 inches long, weighs 1.65oz). Perfect for backpackers, hunters, scouts, travelers, emergency kits.