“I drank filtered swamp water”
In the name of testing water purifiers
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The Recommendation

January 16, 2026

This filter makes gallons of clean water without electricity or plumbing

A photo of a LifeStraw Escape Membrane Ultrafilter Replacement in front of an orange background (left) and a photo of a LifeStraw Escape out in a marshy area (right).
NYT Wirecutter

Writer Tim Heffernan is no stranger to going to extreme lengths in the name of testing: burning thousands of matches to test air purifiers, subjecting countless dehumidifiers to dank, muggy basements, and much, much more. Most recently? He drank swamp water to test this cooler-esque filtration device.

Unlike other effective-but-imperfect water filtration methods, this high-capacity water filter virtually eliminates bacteria and viruses — without electrical power or plumbing. You just fill it from any available water source and pump it by hand.

To put it to the test, Tim collected water from a local stagnant creek — filled with rainfall, runoff from the adjacent golf-course-slash-Canada-goose-landing-strip, cyanobacteria, and marine fuel — filtered a couple gallons, and drank 40 ounces over the course of a day. “I came through completely unscathed,” he writes. “The water also tasted nice — without a hint of swampiness.”

A uniquely robust solution to access clean drinking water

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Cheers.

You can reach the Wirecutter Newsletters team at newsletters@wirecutter.com. We can’t always respond, but we do love to hear from you.

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