EPA Registered Purifier, Aquamira Water Purifier Tablets contain a patented chlorine dioxide formula that produces a powerful germicidal agent when released in water. When used as directed, Aquamira Water Purifier Tablets meet the EPA guidelines for Microbiological Water Purifiers making it the safest solution on the market. Great for weekend hiking, camping, hunting, or fishing trips. The 12 pack is perfect for 72 hour emergency kits. Aquamira Water Purifier Tablets will not discolor water and will actually improve the taste of treated water.