For years, the conventional wisdom in the United States was that while bacteria and organisms such as the giardiasis protozoa were a concern for backpackers, viruses such as the norovirus and hepatitis were not. Today, while viruses remain what is probably a low risk, it can’t be said that there is no risk of contracting one from drinking backwoods water. And viruses can be nasty things. The norovirus聴which has ruined many a cruise-ship vacation in recent years聴causes severe diarrhea and vomiting that can last several days. Hepatitis is even worse; hepatitis B can kill you, although the more common hepatitis A usually corrects itself on its own after a few weeks.

So, what to do? Always filter water, of course. Beyond that, my policy is to consider its source. The closer I am to where the water got its start聴a glacier, a snowfield, a spring聴the less concerned I am about viruses. I don’t think the Adirondacks area poses a particular risk, but its high usage by humans might warrant caution. If you are concerned, then it’s prudent to treat the water with a virus-killing agent such as SweetWater Purifier ($9; www.msrcorp.com), a chlorine-based agent that kills just about anything that wiggles… in your water, that is.
Otherwise, you might want to consider one of Katadyn’s filtration pumps, albeit a little more costly and bulky, but able to deliver quick, potable water on the go. The 11-ounce Katadyn Hiker ($60; www.katadyn.com) is a compact system that delivers about a liter a minute without too much effort聴great if you’re in a group or don’t fancy the aftertaste of some of the chemical treatments.
Get more water-filtration advice in 国产吃瓜黑料‘s .