A dependable and popular water filter with average weight and pump speed, the MSR Sweetwater Microfilter is easy to use, has a comfortable leveraged pumping handle, and is effective against bacteria and protozoa, but not viruses. It is very similar in features to the Katadyn Hiker Pro, having almost identical weight 13.5+ ounces, pump-time (1.5 min per liter), capacity (750 liters), and price ($90).
The Sweetwater provides excellent value, dependability, and ease of use for the price, and can treat as much or as little water as needed. For the fastest working filter, go with the Platypus Gravityworks Water Filter, our Editors' Choice winner. However, the SweetWater has the ability to suck water out of smaller, siltier sources than the Platypus, making it slightly more versatile. If you are interested in the lightest and most economical method to purify your water, check out Aquamira Water Treatment Drops.
The MSR SweetWater Purifier System is a nice upgrade from the Microfilter that we tested. For $100, MSR provides a chlorine-based SweetWater Purifier solution to inactivate viruses to provide exceptionally clean water. If you're planning on travel to remote, developing countries or certain wilderness zones, the added protection of the chlorine solution may make the SweetWater Purifier System the perfect purifier for you.