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I'm very dubious that the flyers claim that they can be reactivated by washing is accurate. I would not expect that of activated carbon (which is what it is), at least not under normal washing conditions. I can find no reference to reactivation on the manufacturers (of the material , which is normally used in gas masks and protective suits). The note that the material preferentially absorbs oxygen and so care should be taken in confined spaces, though perhaps (?) this would not affect this use of it