While items 301 and 305, Potable Aqua Germicidal Tablets, are an EPA registered product that does not require an expiration date, we do a have a recommend shelf life of four to five years. This product should be stored as per label requirements in a cool, dry place and if you have any concerns, you should buy a new bottle. If the Iodine tablets are grayish/brown in color, they are good and tablets yellowish/green should be replaced.
Bottles that have been opened should be replaced after one year or by the next season.










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