Close banner

Support Outside Online

Love Outside?

Help fund our award-winning journalism with a contribution today.

Contribute to Outside
Gear Guy

What do you think of the MIOX water purifier?

What do you think of the MIOX water purifier? Jeff Moscow, Idaho

A: MSR's recently introduced MIOX Purifier ($130; is an exceedingly clever device. Developed for the military, it uses an electrical charge to convert salt into a solution that kills bacteria, microorganisms, even viruses. MIOX stands for "mixed oxidants," which is the stuff that's produced to purify the water.

MIOX Purifier

Using it is extremely simple. You put some water into the flashlight-sized device, shake it, then push a button on the side. That process mixes in the purifying salts and triggers the electrical current (from two lithium batteries) that converts the saltwater mixture into the oxidants. Then, you pour this stuff into your water. Paper test strips that come with the MIOX are dipped into your water to tell you when it's safe to drink. The most amazing thing is that the four-ounce MIOX device, two batteries, and one ounce of purifying salt can render 200 liters of drinkable water. That's pretty amazing. Compared with filters, it's much easier to use and much better for handling the water needs of a group.

Is there a downside? Alas, yes. The purifying solution takes time to work. That ranges from 15 minutes to kill viruses and bacteria, 30 minutes for giardia, and up to four hours for cryptosporidia. So you can't just stop at a stream, drink, and be on your way. But, you can use a water filter such as MSR's MiniWorks EX ($80) to filter out those water-borne nasties, then use the MIOX to take care of the germs. That would give you safe water in 15 minutes, which isn't bad. And there's no funny taste.

Support Outside Online

Our mission to inspire readers to get outside has never been more critical. In recent years, Outside Online has reported on groundbreaking research linking time in nature to improved mental and physical health, and we’ve kept you informed about the unprecedented threats to America’s public lands. Our rigorous coverage helps spark important debates about wellness and travel and adventure, and it provides readers an accessible gateway to new outdoor passions. Time outside is essential—and we can help you make the most of it. Making a financial contribution to Outside Online only takes a few minutes and will ensure we can continue supplying the trailblazing, informative journalism that readers like you depend on. We hope you’ll support us. Thank you.

Contribute to Outside
Lead Photo: courtesy, MSR