Your Ultralight Purifier Bottle may last 300 times before it stops filtering pathogens and particulates, but you don't know how many times you'll use it on your longer travels, so be sure to have Grayl's spare Purifier Cartridge packed. This cartridge has a shelf life of ten years, just in case you don't end up using it on your next trip.
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Grayl Purifier Cartridge ships and sold by Backcountry
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