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  • Ultraviolet (UV-C) light rays safely sterilize clear water by destroying 99.9% of protozoa (including Giardia and Cryptosporidia), bacteria and even viruses
  • SteriPEN Aqua protects you from waterborne microorganisms that cause diseases such as botulism, cholera, dysentery and typhoid, to name a just few
  • Easy-to-use—just press activation button, place in water and stir
  • Ultraviolet lamp turns off when treatment is complete and purifies up to 3,000 liters of water so you'll feel secure for years to come
  • Purifies up to 150 liters of water on 4 AA batteries (not included)
  • Great when traveling to areas with risky water, but keep it handy at home for emergencies and boiled water advisories
  • SteriPEN Aqua keeps as many as 6,000 plastic water bottles out of the waste cycle
  • SteriPEN is tested and certified by the Water Quality Association against the US Environmental Protection Agency Microbiological Water Purifier Standard
  • SteriPEN UV water purifiers use same technology employed in water treatment plants and bottling companies for over 100 years


View all SteriPEN Ultraviolet Water Purifiers

REI membership


Best Use Backpacking, Travel
Filter Type Ultraviolet
Filter Medium Ultraviolet light
Removes/Destroys Protozoa, Bacteria, and Viruses
Pump Force Not applicable
Pump Strokes Per Liter Not applicable
Output 32 fl. oz. per 90 seconds
Housing Material Not applicable
BPA Free Yes
Field Cleanable Yes
Dimensions 7.3 x 1.7 x 1.7 inches
Weight Without batteries: 3 ounces
Rated 5 out of 5 by from Love my SteriPEN when I'm traveling! I had an old Classic model and used it on many trips to places where I thought the water was too risky. Can't tell you how many times my friends thought I was being over-cautious and then they'd end up stuck in their hotel rooms with the crud while I was enjoying the day. Gave my old Classic to one of those friends and bought a new Aqua! I will never travel without it!
Date published: 2015-08-04
Rated 5 out of 5 by from Love it! The best thing in my suitcase! This worked out great on a recent trip to Mexico. It was perfect for my needs and I didn't have any intestinal issues (unlike some of my friends!) One set of battery was all that was needed for a week. I totally recommend this if your traveling and I plan to use it on hikes this summer.
Date published: 2015-06-03
Rated 3 out of 5 by from Red-lighted even with good batteries Used five days in a row, maybe five liters a day, then it started red-lighting in the middle of session. Batteries are Duracell Quantum with the builtin power check "thermometer" showing some use, but still well within green, so doesn't seem like a battery problem. Not sure what to think of this.
Date published: 2017-01-03
Rated 1 out of 5 by from Did not work Very fickle product. I tested it out at home and it worked fine. But when I needed it on the mountain, it did not work. (Said it did not have batteries even though I had put in a fresh set.) If you use this, please bring a back-up purification system. Definitely will return this.
Date published: 2015-08-25
Rated 1 out of 5 by from Didn't work when I needed it I have carried this little gadget on all kinds of trips, and when I finally needed it to work it wouldn't turn on. Changed the batteries and tried again, and still no luck. Will definitely return this on my next trip to REI.
Date published: 2015-04-30
Rated 4 out of 5 by from Great product. So far, so good! I was however a little frustrated that the unit did not work the first time. The instructions are not clear enough about how to install the batteries. On the pen itself, after opening the battery compartment, you see +- in all four positions. I did not have the manual with me nor access to the Internet. So after trial and error, I finally got it right! I was a bit disconcerting.
Date published: 2016-02-17
Rated 3 out of 5 by from Sterip didn't last as long as expected I was traveling in SoAm among hotels and the pen's batteries went far too soon and I couldn't find my new set of batteries. A bit disappointing. Get the plug in if not camping.
Date published: 2016-12-01
Rated 1 out of 5 by from Doesn't work at all!! I brought this product because I have to go to abroad with my 10 months son, I have infant this the most reason I brought but this product not work at all, so I do use boiling water for my son. I waste money on this product. I do not recommend this product, please do not buy.
Date published: 2017-01-12
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