Aquamira Water Purification Tablets contain a unique chlorine dioxide formula that produces a powerful germicidal agent when released in water. This formula meets the stringent EPA guidelines for Microbiological Water Purifiers making it the safest solution on the market. Each tablet purifies one liter of water and is conveniently sealed in an individual child resistant foil pouch. To use, remove 1 Aquamira Water Purifier Tablet from its foil packaging and quickly insert into 1 liter (34 fl oz) of contaminated water. Allow to react for four hours in an area away from sunlight in order to generate a use-solution of 4ppm Chlorine Dioxide. The treated water is now ready for drinking. See outer package for further instructions.