I recently purchased a Katadyn water filter from you because I was impressed with it's reviews and the fact that it could pump 2 liters of water in a minute. I have been backpacking for 30 plus years and have owned a few water pumps. This is by far the worst pump I have owned. I got the pump this last spring and used it in the Teton mountains in Wyoming for an overnight trip of about 25 miles. It performed OK (not 2 liters per minute - but OK). I then went on a 6 day trip in the Wind River range. On the first day the pump was slow, 10-15 minutes a liter. After that it got even slower, a minimum of 20 minutes per liter. Needless to say we quit using it and opted for boiling and treating water with chemicals. every night in camp I disassembled the pump completely to try and alleviate the problem with no success. We concluded the filter was completely clogged even though it looked brand new. Also, all the water I was pumping was very clear with no glacial silt or particulate. I would like to understand what happened, but I'm probably going to purchase a different pump very soon.