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In an emergency, you need something that's dependable and fool-proof. Katadyn® Emergency Drinking Water Tablets are specially formulated to disinfect water when other methods are not possible. Each tablet disinfects 1 liter (about 1 quart) of water for drinking or cooking. Effective against viruses, bacteria, Giardia and Cryptosporidium. Also removes bad tastes and odors. Simply add tablet to a quart of water and let sit away from sunlight for four hours.