like Tom I really enjoyed the Sawyer filters. especially when I ran across a cold/cool stream, But the clogging has forced me to go to the aquamira drops. last long hike I tested the "still working" mini passed water so I packed it along for a 140miler.....15 minuets into my hike I pulled it out at a small stream- it had clogged up just 10hours after testing at home. just not willing to trust sawyers anymore.