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Details

  • Ultra features an internal battery that's recharged from any USB power source; connect the included USB cable and start charging from a solar panel, laptop or car power port
  • Low-power indicator lets you know when battery needs recharging; when fully charged you can treat 50L
  • Ultraviolet (UV-C) light rays safely sterilize clear water by destroying 99.99% of protozoa (including Giardia and Cryptosporidia), bacteria and even viruses
  • SteriPEN protects you from risks that cause botulism, cholera, dysentery and typhoid, just to name a few
  • To purify your water, just press a button and gently agitate the water with a quick stir
  • Purifies 16 fl.oz. of water (cold or warm) in less than a minute or treat 32 fl. oz. in 90 seconds
  • Ultra is designed to fit perfectly into store-bought bottles of water; just insert the Ultra into the bottle, flip the bottle upside down and start treating the water
  • Small size fits most containers—use it in cups, mugs, water bottles and canteens
  • SteriPEN turns itself off once ultraviolet treatment is complete; can be used up to 8,000 times!
  • Watertight seals keep water away from the electronics; rubberized inset grips for secure handling in wet conditions
  • Long used by municipal water districts and bottling companies, low-level UV-C light treats water safely, and unit's light will not damage eyes or skin
  • Use only on clear water, as cloudy, sediment-laden water hinders effectiveness; FitsAll prefilter (sold separately) clears particulates and debris from water
  • Includes SteriPEN Ultra water purifier, USB cable, carrying case and instruction manuals
  • SteriPEN Premium Lamp Life Pledge lets you register your purchase to receive a replacement SteriPEN after 8,000 uses; find details at steripen.com/pledge

Imported.

SteriPEN water purifiers meet U.S. Environmental Protection Agency standards for microbiological water purifiers and have been independently tested by the Oregon Health Sciences University and the universities of Arizona and Maine. For complete test results visit www.steripen.com.



View all SteriPEN Ultraviolet Water Purifiers

REI membership

Specs

Best Use Backpacking
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 sec.
Housing Material Not applicable
BPA Free Yes
Field Cleanable Yes
Dimensions 7.3 x 1.6 x 1.3 inches
Weight With integrated battery: 4.8 ounces
Rated 5 out of 5 by from What? No charger included? My friends convinced me that the Steripen ULTRA was the best model for me. They particularly appreciated the LED readout which was easy to read and interpret in all lighting conditions. As this model's major feature was USB charging rather than batteries, I was surprised that there was no acutal WALL CHARGER/AC Adapter in the box, and no mention in the manual about what sort of charger to use. I called my friend, and his Ultra, 2 years old, did come with the charger. I checked with STERIPEN, and they say that you can recharge using ANY cell phone USB charging unit, 5volts, 1amp. I find that satisfactory, but why not explain in the instructions?
Date published: 2014-07-08
Rated 5 out of 5 by from USE THIS FOR TRAVEL TO ASIA!! I used the Steri-pen EVERY DAY for a month in Nepal in July 2013. In Nepal, even bottled water is not safe to drink (as indicated by the WHO). I filtered through the 40 Micron Fits-All filter, first, then twist that filter out and put the Steri-pen in and shake gently for 90 seconds until smiley face pops up. The USB charge lasted the entire month! Also, since I home-stayed with poor families who normally have to boil water for their boarders, the Steri-pen eliminated the need for using costly cooking fuel.
Date published: 2014-01-12
Rated 4 out of 5 by from Excellent use in the backcountry I just completed the John Muir Trail using this as my sole water purification method. I had bleach as a backup, but didn't have to use it. The Steripen worked flawlessly for me every time, and left me confident that my water was pure. The only issue I had was one time when the battery indicator showed a half charge, but when I inserted the pen in the water, it flashed a frown face and showed inadequate battery level. Fortunately I had a solar battery charger and was able to recharge the battery and continue using the pen. After that I made sure to recharge the battery whenever the charge indicator went below 3/4. I had to buy a Nalgene bottle that had a mouth wide enough to fit. The bottle had to be quite full for the pen to reach deep enough. Otherwise it was convenient and simple to use.
Date published: 2013-08-16
Rated 4 out of 5 by from Easy to use and fast I recently bought the Steripen Ultra for a multi-day backpacking trip in the Adirondacks. I love that it is lightweight, small and fast. I especially liked being able to fill bottles at the river and then bring them back to the campsite to purify the water instead of having to do it at the source. I put some pantyhose over a small 1L soft bottle for filtering purposes then poured the water into a wide mouth Nalgene to purify and it worked great! The steripen let me know right away if I didn't have the pen far enough into the water and I got the frowny face.
Date published: 2013-08-26
Rated 5 out of 5 by from Great product The Steripen works great. just used it for the first time on a trip with lots of water crossings. I kept it on my belt the entire way stopping and getting clean water as needed. It allowed me to carry less water at a time, and without getting out the tubes and hassle of a normal water pump, I could fill the bottle up as I passed by a creek and purify as I walked. Just make sure the mouth of your water bottle allows for the size of the pen plus a little more for stering. All the doubt of the item went out the door once I used it.
Date published: 2013-06-18
Rated 4 out of 5 by from Works This is the first UV purifier I've used having used various pump-type filters for many years before this. It's much easier to use (smaller and lighter too) than any filter; however, one thing to keep in mind - it doesn't address any residual water on the threads of your water bottle (assuming it was filled by dipping into your water source). So, be careful to also rinse the thread/cap with purified water after treatment. The purifier seems well built and well thought out though it is affected by the cold and the screen is a little hard to read in the direct sun, as you would expect. As others have noted, ice cold water will slow the purification process down, but not by too much. The other thing to be aware of, the battery will be negatively affected (like they all are) by cold temps. So, don't leave it out on very cold nights because it may not work right away in the morning (perns. experience; once I warmed it up, it worked fine). The thing is very easy and pretty fool proof to use (press the button and watch the countdown indicator). I've used it in temps. ranging from below freezing to really warm. I have not had it long enough to comment on its durability nor its advertised "50 cycles" of uses per charge. My water sources too, so far (three multi-day backpacking trips), have been clear Sierra Nevada streams and lakes (I carry backup purification tablets too, just in case; you never know).
Date published: 2013-06-21
Rated 4 out of 5 by from Light and Easy Lighter and smaller than my pump filter and no chemical taste added to water. Get the pre-filter to help get particulates out. I've used it in Idaho's high mountain lakes and creeks which are clean to begin with. If your water source is going to be muddy, use a tradition pump filter.
Date published: 2013-06-28
Rated 4 out of 5 by from Easiest purification yet Just used this Steripen on an overnighter in the GSMNP, and it was so much easier than pump filters I have used. I used pantyhose to strain water into 2 widemouth liter bottles (used these to gather water for cooking and for hydropacks for two of us) and then used the pen's uv light to sterilize. It was below freezing for much of the trip and it takes the pen over 90 seconds per liter in cold temps to give you the "smiley face" all clear.
Date published: 2013-03-31
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Can you use the SteriPen Ultra in the rain? Do I have to worry about it if it gets wet?

Asked by: Shasta6
The manufacturer explains that the watertight seals help keep water away from the electronics when handling in wet conditions.
Answered by: REIservice
Date published: 2017-06-29

Can I recharge it at any time and maintain the life of the battery, or do I need to wait until the battery dies first before recharging?

Asked by: Kendromeda
You can recharge the battery at any time to maintain the life of the battery. You do not need to wait until the battery dies before recharging.
Answered by: REIservice
Date published: 2017-06-28

How long does a single battery charge last in standby time (not actively using the purifier)?

Asked by: Micah Davis
The battery will hold its charge when stored for an extended period of time without being used. SteriPEN recommends recharging the Ultra Water Filter every six months to maintain peak performance.
Answered by: REIservice
Date published: 2017-05-03

I have a 64oz stainless steel water bottle. Can the SteriPEN treat all 64oz of water if it is given enough treatment time, or can it only be used with a bottle that holds 32oz of water or less?

Asked by: CollinAK
The manufacturer does not recommend treating water with the Ultra Water Purifier in quantities greater than 32 fluid ounces.
Answered by: REIservice
Date published: 2017-06-29

What do users of this product say about the taste of the filtered water?

Asked by: dizygyrl14
The Ultra Water Purifier is not a filter. It does not remove any particulate matter from the water you are treating. It uses UV light to kill all micro-organisms in the water being treated, but does not remove them. Once treated, the water will be safe to drink, but otherwise it will taste and look the same. It is important for the water to be "optically clear" before treatment. Pre-filters can be purchased to make the water optically clear, but they also will not change the flavor of the water. https://www.rei.com/product/784450/steripen-fitsall-filter​
Answered by: REIservice
Date published: 2017-06-29

I'm curious whether these can be used with wide-mouth tumblers other than the Nalgene water bottles, such as a stainless steel Thermos/Contigo?  I am considering the SterPEN Adventure vs. Ultra (small sz&wt w/batt vs lg sz&wt w/USB), any suggestions? Thx.

Asked by: Hiker at Heart
Both of the SteriPEN models you mention will work in any water container with a wide mount. The Ultra model is designed more for a traveler who isn’t concerned about weight and has access to a USB source for recharging. The Adventure OPTI, item # 799003, is better for the backpacker or person who needs to keep weight low, and can replace batteries when needed.
Answered by: REIservice
Date published: 2017-07-17

If I'm on an extended backpack trip, it is possible to put in a new set of batteries if I exceed the life of one set?

Asked by: BDWW
The rechargeable battery is not designed to be replaced. On extended trips, we suggest taking a solar charger.
Answered by: REIservice
Date published: 2017-06-29

How many liters will the device purify on one charge?

Asked by: Peter on the Trail
From SteriPEN: "When fully charged, Ultra will treat 100 half-liters or 50 full-liters of water and its UV lamp will last for 8,000 treatments."
Answered by: REIservice
Date published: 2017-05-03
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Back to top

Please select a color/color.

Reviews

Rated 5 out of 5 by from What? No charger included? My friends convinced me that the Steripen ULTRA was the best model for me. They particularly appreciated the LED readout which was easy to read and interpret in all lighting conditions. As this model's major feature was USB charging rather than batteries, I was surprised that there was no acutal WALL CHARGER/AC Adapter in the box, and no mention in the manual about what sort of charger to use. I called my friend, and his Ultra, 2 years old, did come with the charger. I checked with STERIPEN, and they say that you can recharge using ANY cell phone USB charging unit, 5volts, 1amp. I find that satisfactory, but why not explain in the instructions?
Date published: 2014-07-08
Rated 5 out of 5 by from USE THIS FOR TRAVEL TO ASIA!! I used the Steri-pen EVERY DAY for a month in Nepal in July 2013. In Nepal, even bottled water is not safe to drink (as indicated by the WHO). I filtered through the 40 Micron Fits-All filter, first, then twist that filter out and put the Steri-pen in and shake gently for 90 seconds until smiley face pops up. The USB charge lasted the entire month! Also, since I home-stayed with poor families who normally have to boil water for their boarders, the Steri-pen eliminated the need for using costly cooking fuel.
Date published: 2014-01-12
Rated 4 out of 5 by from Excellent use in the backcountry I just completed the John Muir Trail using this as my sole water purification method. I had bleach as a backup, but didn't have to use it. The Steripen worked flawlessly for me every time, and left me confident that my water was pure. The only issue I had was one time when the battery indicator showed a half charge, but when I inserted the pen in the water, it flashed a frown face and showed inadequate battery level. Fortunately I had a solar battery charger and was able to recharge the battery and continue using the pen. After that I made sure to recharge the battery whenever the charge indicator went below 3/4. I had to buy a Nalgene bottle that had a mouth wide enough to fit. The bottle had to be quite full for the pen to reach deep enough. Otherwise it was convenient and simple to use.
Date published: 2013-08-16
Rated 4 out of 5 by from Easy to use and fast I recently bought the Steripen Ultra for a multi-day backpacking trip in the Adirondacks. I love that it is lightweight, small and fast. I especially liked being able to fill bottles at the river and then bring them back to the campsite to purify the water instead of having to do it at the source. I put some pantyhose over a small 1L soft bottle for filtering purposes then poured the water into a wide mouth Nalgene to purify and it worked great! The steripen let me know right away if I didn't have the pen far enough into the water and I got the frowny face.
Date published: 2013-08-26
Rated 5 out of 5 by from Great product The Steripen works great. just used it for the first time on a trip with lots of water crossings. I kept it on my belt the entire way stopping and getting clean water as needed. It allowed me to carry less water at a time, and without getting out the tubes and hassle of a normal water pump, I could fill the bottle up as I passed by a creek and purify as I walked. Just make sure the mouth of your water bottle allows for the size of the pen plus a little more for stering. All the doubt of the item went out the door once I used it.
Date published: 2013-06-18
Rated 4 out of 5 by from Works This is the first UV purifier I've used having used various pump-type filters for many years before this. It's much easier to use (smaller and lighter too) than any filter; however, one thing to keep in mind - it doesn't address any residual water on the threads of your water bottle (assuming it was filled by dipping into your water source). So, be careful to also rinse the thread/cap with purified water after treatment. The purifier seems well built and well thought out though it is affected by the cold and the screen is a little hard to read in the direct sun, as you would expect. As others have noted, ice cold water will slow the purification process down, but not by too much. The other thing to be aware of, the battery will be negatively affected (like they all are) by cold temps. So, don't leave it out on very cold nights because it may not work right away in the morning (perns. experience; once I warmed it up, it worked fine). The thing is very easy and pretty fool proof to use (press the button and watch the countdown indicator). I've used it in temps. ranging from below freezing to really warm. I have not had it long enough to comment on its durability nor its advertised "50 cycles" of uses per charge. My water sources too, so far (three multi-day backpacking trips), have been clear Sierra Nevada streams and lakes (I carry backup purification tablets too, just in case; you never know).
Date published: 2013-06-21
Rated 4 out of 5 by from Light and Easy Lighter and smaller than my pump filter and no chemical taste added to water. Get the pre-filter to help get particulates out. I've used it in Idaho's high mountain lakes and creeks which are clean to begin with. If your water source is going to be muddy, use a tradition pump filter.
Date published: 2013-06-28
Rated 4 out of 5 by from Easiest purification yet Just used this Steripen on an overnighter in the GSMNP, and it was so much easier than pump filters I have used. I used pantyhose to strain water into 2 widemouth liter bottles (used these to gather water for cooking and for hydropacks for two of us) and then used the pen's uv light to sterilize. It was below freezing for much of the trip and it takes the pen over 90 seconds per liter in cold temps to give you the "smiley face" all clear.
Date published: 2013-03-31
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Questions & Answers

Can you use the SteriPen Ultra in the rain? Do I have to worry about it if it gets wet?

Asked by: Shasta6
The manufacturer explains that the watertight seals help keep water away from the electronics when handling in wet conditions.
Answered by: REIservice
Date published: 2017-06-29

Can I recharge it at any time and maintain the life of the battery, or do I need to wait until the battery dies first before recharging?

Asked by: Kendromeda
You can recharge the battery at any time to maintain the life of the battery. You do not need to wait until the battery dies before recharging.
Answered by: REIservice
Date published: 2017-06-28

How long does a single battery charge last in standby time (not actively using the purifier)?

Asked by: Micah Davis
The battery will hold its charge when stored for an extended period of time without being used. SteriPEN recommends recharging the Ultra Water Filter every six months to maintain peak performance.
Answered by: REIservice
Date published: 2017-05-03

I have a 64oz stainless steel water bottle. Can the SteriPEN treat all 64oz of water if it is given enough treatment time, or can it only be used with a bottle that holds 32oz of water or less?

Asked by: CollinAK
The manufacturer does not recommend treating water with the Ultra Water Purifier in quantities greater than 32 fluid ounces.
Answered by: REIservice
Date published: 2017-06-29

What do users of this product say about the taste of the filtered water?

Asked by: dizygyrl14
The Ultra Water Purifier is not a filter. It does not remove any particulate matter from the water you are treating. It uses UV light to kill all micro-organisms in the water being treated, but does not remove them. Once treated, the water will be safe to drink, but otherwise it will taste and look the same. It is important for the water to be "optically clear" before treatment. Pre-filters can be purchased to make the water optically clear, but they also will not change the flavor of the water. https://www.rei.com/product/784450/steripen-fitsall-filter​
Answered by: REIservice
Date published: 2017-06-29

I'm curious whether these can be used with wide-mouth tumblers other than the Nalgene water bottles, such as a stainless steel Thermos/Contigo?  I am considering the SterPEN Adventure vs. Ultra (small sz&wt w/batt vs lg sz&wt w/USB), any suggestions? Thx.

Asked by: Hiker at Heart
Both of the SteriPEN models you mention will work in any water container with a wide mount. The Ultra model is designed more for a traveler who isn’t concerned about weight and has access to a USB source for recharging. The Adventure OPTI, item # 799003, is better for the backpacker or person who needs to keep weight low, and can replace batteries when needed.
Answered by: REIservice
Date published: 2017-07-17

If I'm on an extended backpack trip, it is possible to put in a new set of batteries if I exceed the life of one set?

Asked by: BDWW
The rechargeable battery is not designed to be replaced. On extended trips, we suggest taking a solar charger.
Answered by: REIservice
Date published: 2017-06-29

How many liters will the device purify on one charge?

Asked by: Peter on the Trail
From SteriPEN: "When fully charged, Ultra will treat 100 half-liters or 50 full-liters of water and its UV lamp will last for 8,000 treatments."
Answered by: REIservice
Date published: 2017-05-03
  • y_2017, m_7, d_19, h_16CST
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  • QUESTIONS, PRODUCT