These packets are issued by the U.S. military.
They eliminate giardia and most bacteria, viruses and other micro-organisms in treated water. Also helps reduce sediment.
One packet purifies one liter or quart of water, and each package (as pictured) contains 30 packets individually sealed in foil pouches. Treatment takes up to 20 minutes and requires some shaking and pouring.
Great for use when hiking, camping, exploring, traveling in third world countries, or for emergency situations.