Our Emergency Drinking Water Tablets and Two-Step Drinking Water Purification tablets have a suggested shelf-life of 4 years. Each bottle features a date printed on the label that informs you of the manufacture date (this is not an expiration date). These products should be stored in a cool, dry place as per the instructions on the label. Tablets that are grayish/brown in color are safe to use. If your tablets are yellowish/green, you should replace them. Bottles that have been opened should be replaced after a year.
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