The advent of portable travel water filters has been a boon to wilderness hikers who are usually forced to obtain water from unclean sources. Filters work as well in the wilderness, the desert, or anywhere else. Their utility lies in the ability to provide you sufficient quantities of drinking water almost immediately.
Mountain Safety Research (MSR) manufactures MSR water filters which, like many travel water filters use ceramic water filter technology. The MSR water filter has a ceramic element to handle bacteria and a carbon element to remove chemical contaminants.
When buying travel water filters, you should check that the fittings include sturdy, large-diameter intake hoses that should be fairly long. Replacement filter cartridges are recurring maintenance items for filters, so you should also ask how much they cost.
If you're hiking with a big group of people, you may prefer larger MSR water filter models for more output. The pumps in the larger models have no difficulty extracting copious quantities of water even if you have to use long intake hoses to reach the water source. However, the larger models are heavier so if you're going in small groups, on solo trips, or for long-distance backpacking, small filters are undeniably more advantageous.
A good alternative might be the mini-works MSR water filter model, which weighs about a pound. Its lever pump mechanism is easy to use and sturdy enough to endure through long years of use (it's currently issued to some US marine corps units). But if you'd like to avoid having to pump and won't need so much water anyway, you can try the pump-free MSR water filter series. These are small pocket-sized water filters that utilize mixed-oxidant technology originally developed for the military. Since they're so handy, you can bring them along when you go backpacking or white-water rafting.
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