Instruct: Classify a given review into positive or negative sentiment.
Query: Simple, dependable filter

I purchased this product upon the strong recommendation of my brother, who has extensive backcountry hiking and camping experience. The filter is simple to use, pumps quickly, and is very easy to disassemble, clean, and reassemble.Unlike some other reviewers I feel it's sufficiently robust, especially considering it's relatively light. Keep in mind it requires regular cleaning and drying for optimal performance.My only request (and a minor one, at that) would be for the little instruction guide to be printed on waterproof paper.