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As a pile-on to this comment for everyone else: the main reason for this is that filters can not reliably remove viruses from water. If you're up in the woods or working from rainwater, that's fine... if you're working with grey water or worse, a filter will result in a nice crystal clear hepatitis cocktail with a twist of norovirus.Bought a Lifestraw Mission 12L water purifier, not filter. You will need a purifier following a disaster because every water source will be contaminated with human waste following a large-scale disaster and the absence of a sanitary sewer system.
You can get by with filtration only if you know the quality of your source water is at least decent.