Consumer-generated reviews, buying tips and advice, ratings, price information, and searchable in a variety of ways from price to product type.

Tips and recommendations on avoiding giardia and using water filters while backpacking, trekking and hiking.

A shopping site which also mixes in consumer information, including decision tips, product types available, and features to consider.

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.

Reviews of water filters, as submitted by the users.