Title: they work. but are messy. bring an extra ziplock.
Product review: last forever. are very effective. just in order to use, you must soak the little iodine pellets in water inside this bottle for an hour. THEN pour it into your water source. can get a little messy. but for the price, how effective it is, and getting 1000's of uses out of one bottle, you cant go wrong.
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