ThankYou wrote a review of MSR SweetWater Microfilter on July 8, 2012
I have used the Sweetwater purifier extensively while backpacking throughout Utah. It works great in the swift rivers and high alpine lakes of the Uintas and also the trickling creeks and remote waterfalls of Coyote Gulch and Dark Canyon. On average I can efficiently pump about 3 liters in 10 minutes after a fresh cleaning. You need to clean it about once every 9 liters or so. Its easy to clean, easy to store, easy to pack up, and easy to carry. Five stars and I highly recommend this thirsty backpacker's best friend!