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The Wide Mouth was selected by our readers—and by our editors—as one of their favorite water bottles. The Nalgene’s tough, BPA-free plastic can take a beating; we’ve slung ours around at crags, banged them against rocks, and generally abused them for years. Yet they still work just as intended—no…

Up-to-date guidelines on the pros and cons of filters, ultraviolet light, chemicals, and other options

Melting snow for drinking water isn't as easy as it sounds

The LifeStraw’s membrane removes 99.9 percent of bacteria and parasites. We like it so much we included a version of the filter in our 2018 roundup of the best men's thru-hiking gear.

Those tasty bivalves we can't get enough of are also great for filtering pollutants out of the water, but there's a balance that comes with building more oyster farms

We picked the Universal Filter in our 2019 Summer Buyer’s Guide as one of the best pieces of travel tech gear. The filter has a two-stage process with a microbiological filter and an activated carbon capsule so it protects against bacteria, parasites, microplastics, and chemicals.

Removing 99.99 percent of bacteria and protozoa, the Meta Bottle is a collapsible and BPA-free. Fill it with water, then shake for speedy filtration—up to two liters per minute. Plus, it’s dishwasher safe.

Made for kids, this water bottle filters out bacteria, parasites, and chemicals and improves the overall taste for your little one. It lasts for up to 1,000 gallons of filtering and only weighs 7.9 ounces.

Collect stream water in one of Sawyer’s 32-ounce pouches, then filter it through the hollow-fiber membrane to remove bacteria and protozoa. The pouches are collapsible (each weighs only three ounces) and reusable, and you can drink straight from the filter’s nozzle or pour the water into a bottle for later.

Katadyn took a handy one-liter water bottle, which rolls up small to save space in your pack, and put a 0.1-micron microfilter in its nozzle that removes 99.9 percent of nasties. The BeFree can purify up to 1,000 liters over its lifetime.

Instead of filtering water, these dissolving tablets purify it with EPA-approved sodium dichloroisocyanurate. Complicated name, but essentially it kills viruses, bacteria, and cysts in a quart of water in 30 minutes. The price ($10 for 30 individually wrapped tablets) and tiny size make Aquatabs the ideal backup on long trips.

Like its predecessors, the Sawyer Micro Squeeze removes 99.9 percent of bacteria, but through a much lighter and smaller package.

Boyan Slat, the 24-year-old founder and CEO of the Ocean Cleanup, has finally launched a system he says will rid the Great Pacific Garbage Patch of half its plastic trash in five years.

Here's what you can do to keep your filter in good shape and how to know when it's time to spring for a new one

Our favorite ultralight filter gets a welcome upgrade

And global warming could bring more of it to the surface

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