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SteriPEN Ultra

3.888888888888889 out of 5 stars
9 Reviews

Out of Stock

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SteriPEN Ultra

Toss the iodine tablets and step up to the most advanced water purifier in the world–the SteriPEN Ultra. The Ultra keeps track of battery status, treatment success, and number of uses and tells you with an easy-to-read high-contrast OLED display. The internal battery is rechargeable via a computer, a standard wall outlet, or SteriPEN's portable solar panel (not included) for up to 8,000 liters of water.


  • Advanced water purifying pen sterilizes rivers and creeks
  • OLED display tracks battery, treatment success, and number of uses
  • USB-rechargeable battery purifies 50 liters of water
  • Filters waterborne bacteria, viruses, and protozoa like giardia and cryptosporidium
  • Item #HYD0027
Purifying Element
UV light
bacteria, viruses, protozoa (giardia, cryptosporidium)
Treatment Time
48 seconds
USB cable, AC adapter, neoprene case, user guide
5.1 x 1.4 x 0.8in
Claimed Weight
water purification on-the-go
Manufacturer Warranty
limited 3 years

Overall Rating

4 based on 9 ratings

Review Summary

1 Stars - 2 reviews
2 Stars - 0 reviews
3 Stars - 0 reviews
4 Stars - 2 reviews
5 Stars - 5 reviews

What do you think about this product?


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5 out of 5 stars

June 28, 2024

Perfect for dodgy water

I relied upon a UV pen to treat many liters of water on the Inca Trail hike and in my hostel in Cusco, and neither I nor my companions had any GI issues. I have had the same great results in Mexico and on my tour down the Great Divide Mountain Bike Route. And- it makes a nice gift for adventurers, even children, because it’s simple to use: submerge in relatively clear water, press a button, and stir. I carry extra batteries, but have never had to use them on a trip, and the case gives me confidence that it will survive in my pack.

user image
joan k

Originally reviewed on

1 out of 5 stars

November 27, 2022

does not function in cool to cold temperatures

I used this item for a 12 day backpacking trip in the Wind River Range in Wyoming in late August - early September. Although it functioned as expected in warm temperatures, it did not work consistently in temperatures in the 40-60ºF range and not at all in lower temperatures. Even if I stored it in my sleeping bag and jacket pockets and pre-warmed the batteries against my body, the device would immediately cool down and cease to function upon use. This renders the pen worthless in most backcountry contexts. Thankfully I had some trusty AquaMira as a backup, and I resigned to using that most hours of the day.

Zoe T

Originally reviewed on

5 out of 5 stars

September 23, 2021

7 days and NO intestinal issues!

I took this on my recent elk hunt and pulled water continually from streams all week long. NO issues with the squirts or sickness so I feel the pen worked perfectly. No issues with the batteries, size or durability at all!

Andy K

Originally reviewed on

1 out of 5 stars

July 29, 2021

Bad quality control, not reliable

I've used it several times

I've tried it in water bottles, nalgenes and even cups. The light will turn on for about 10 seconds then turn off, then I'll get a picture of a light bulb and a frowny face. Apparently the bulb is dead or been damaged right out of the box. Probably stick to a filter or tablets after this. Ended up having to drink snowmelt, lesson learned

Cody A
4 out of 5 stars

July 18, 2021

Easy and compact. Saves me from carrying water weight the bike.

Will P

Originally reviewed on

5 out of 5 stars

May 28, 2021

this is my backup water system

Great backup system that is small and charges off usb Always keep it on hand if our filter fails.

Michael T

Originally reviewed on

5 out of 5 stars

October 18, 2020

long life and very reliable even in desert streams which will clog up many filters. Just don't let it submerge or it ruins the electronics

David H

Originally reviewed on

5 out of 5 stars

June 3, 2020

More confidence

I gave this 5 stars because when paired with the backpacker water filter I know the water my family and I are drinking is safe. I have used it backpacking and hunting all over Alaska and have never had any issues.

Bradley F

Originally reviewed on

4 out of 5 stars

May 24, 2020

The only reason this is not getting 5 stars is because compared to the BeFree filter there is an extra step of work here.

Claudia H

Originally reviewed on