Epinions: Water Filters and Purifiers - Consumer-generated reviews, buying tips and advice, ratings, price information, and searchable in a variety of ways from price to product type.
Giardia Water Filters - Tips and recommendations on avoiding giardia and using water filters while backpacking, trekking and hiking.
Outside Online - 2002 Buyer's Guide: Water Filters - Outside Magazine's guide to water filters and portable hydration systems, including general information plus reviews, descriptions, and photos of the gear tested by their experts.
TheBackPacker.com - Reviews of water filters, as submitted by the users.
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