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Keep the ability to purify water in your pocket with the 20-pack of Micropur Purification Tablets from Katadyn. These tablets are effective in eliminating viruses, bacteria, giardia, and cryptosporidium. Simply place a tablet into a liter of water and wait four hours for the active ingredients to treat your water, as well as improve the taste and odor. This product meets EPA standards for microbiological water purifiers.