SteriPEN Classic 3 with Pre-Filter


5.00 out of 5

The original handheld UV water purifier is now even better!

With one set of four AA alkaline batteries, Classic 3 purifies up to 50 liters or supercharge your Classic 3 with lithium batteries and treat up to 150 liters. With a lamp life of up to 8,000 liters, you'll be drinking safe water for over 7 years!

Consider these


Trusted on mountains and trails for over 15 years, SteriPEN® Classic is the best-selling portable UV purifier of all time. Since 1999, hundreds of thousands of people have ensured their drinking water is safe and avoided ruined adventures with SteriPEN® Classic.

When camping, hiking, backpacking or traveling the Classic 3 with Pre-Filter is the perfect pack to keep you safely hydrated. Classic 3’s UV light destroys over 99.9% of waterborne microorganisms that cause illness.

With SteriPEN Classic 3, one set of four alkaline batteries will treat 100 half-liters or 50 full liters of water. Or supercharge your SteriPEN with a set of lithium batteries and you’ll treat up to 150 liters! Classic 3’s enhanced LED indicator panel lets you know treatment size and status of batteries and UV lamp. Classic 3 is sleek and ergonomic with an easy-to-remove twist-off lamp cover. Like all SteriPEN UV water purifiers, Classic 3 is simple to use: remove the lamp cover, press the activation button, submerge in water and stir. In 48 seconds you have ½ liter of safe drinking water or purify a full liter in 90 seconds. Compared to standard chemical treatments that can take up to four hours, that’s safe water fast without adding chemicals that can leave an unpleasant aftertaste.

The 40×40 micron screen Pre-Filter fits perfectly on wide-mouth one liter water bottles and removes particulates that can get in the way of UV light in water. The Pre-Filter is designed to be stored directly on a wide mouth bottle and the SteriPEN Classic 3 fits perfectly in the filter. Just insert Classic 3 in the filter opening, turn the bottle upside down, and gently rock to circulate light throughout bottle. The tapered end also fits snugly in plastic water bottles. Just insert the lamp into the water bottle, turn it upside down and gently rock the bottle.

  • Ergonomic design with a new easy-to-remove twist-off cap.
  • The first SteriPEN to work effectively with alkaline batteries. Can be powered by alkaline, lithium, or NiMH batteries.
  • Enhanced LEDs indicate treatment size and status of batteries and lamp.
  • Watertight. No more worries about dropping your Classic 3 in a bottle or stream.
  • So easy … just activate, place in water, and stir. LED indicators flash to let you know when water is safe to drink.

This product includes the SteriPEN Premium Lamp Life Pledge. After purchase from an authorized reseller, register your SteriPEN at Reach the lamp life limit (8,000 treatments) and we’ll replace it with a new SteriPEN! For details visit

Contents: SteriPEN Classic 3, carrying case, Pre-Filter, and user’s guide. Three year limited warranty.

Additional Information

Weight 2.9 oz   (82 g)
Dimensions 7.3 x 1.7 x 1.7 in  (186 x 43 x 43mm)
Lamp Life 8,000 activations
Battery 4 AA batteries – Alkaline, Lithium or Rechargeable NiMH (Not included with purchase)
Battery Life Alkaline: 100 treatments (16oz./0.5L) or 50 treatments (32oz./1L), Lithium Disposable: 300 treatments (16oz./0.5L) or 150 treatments (32oz./1L), NiMH: 200 treatments (16oz./0.5L) or 100 treatments (32oz./1L).
Minimium Bottle Diameter 22mm (0.8 inches)
Filter Compatability SteriPEN Pre-Filter Included
User Guide en | fr | es | de

Reviews (4)


  1. :

    Dear Steripen
    My wife Sally and I leave for India in one month embarking on a fairly intense holiday. We are both heavy water drinkers and wish to take the maximum of precautions on this holiday. Steripen looks to be the answer.
    Roman & Sally Kuroczycki

  2. :

    We recently took our Steripen on a trip to Colombia and used it every day to purify tap water from our hotel rooms so that we didn’t have to buy bottled water and contribute to the local landfills. At the end of the trip we did a 3-day trek in the Los Nevados National Park. Our guide told us that most of his clients refuse to drink the water from the rivers even if he purified it with iodine tabs. This posed a problem for him as the park is at a high elevation and his clients needed to drink plenty of fluids to avoid altitude sickness. So we decided to give him our Steripen so that he could use it for his clients and keep them healthy and happy. A happy parting with our Steripen, but we’ll miss it!

  3. :

    This SteriPen works great! The pen is efficient and I’ve used it on several backpacking trips. Its fast and easy, and I like the pre-filter that stops debris from entering the bottle. This is my main water filter when I backpack and camp. My only complaints are (and these are small. I would definitely buy this product again and recommend it to everyone) that (1) unlike the earlier versions of steripens, cleaning 1 L of water requires two clicks of the on button. The older versions required one click for 1 L and two clicks for 1/2 L. It seems to me like the safest thing is to have the 1 L be the first click, just in case someone forgets to click a second time. And 2) the pre-filter air nozzle that screws onto the cap is awkward and the threads are a bit weak. It often takes me several tries to attach the nozzle correctly. All in all, this is a great product and I plan to use it on all my up-coming trips.

  4. :

    Haven’t used it a whole bunch yet but the little bit that I have, it’s been amazing. It came highly suggested by some other avid hikers from my area. I love the outdoors and it’s great to have such a great system to use to keep us hydrated.

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