SteriPEN Classic 3 Purifier with Prefilter
SteriPEN Classic 3 Purifier with Prefilter

Best-Selling Portable UV Filter

The next generation of one of the most trusted portable UV purifiers on the market, the SteriPEN Classic 3 offers a reliable, discreet solution for staying safely hydrated while traveling or on the trail. It removes more than 99.9% of waterborne microorganisms that cause illness, and can treat up to 150 liters using four lithium batteries (or up to 50 liters using four alkaline batteries). The ergonomic, watertight design features a new twist-off cap and enhanced LEDs that display the treatment size, as well as the status of the batteries and UV lamp. With a lamp life of up to 8,000 activations, the Classic 3 gives you safe drinking water for more than seven years.

SteriPEN Classic 3 Purifier with Prefilter
SteriPEN Classic 3 Purifier with Prefilter
SteriPEN Classic 3 Purifier with Prefilter

Easy Operation + Included Prefilter

The SteriPEN Classic 3 is easy to use: Just remove the lamp cover, press the activation button, submerge in the container, and stir—the LED indicators will flash to let you know when your water is ready to drink. You can purify half a liter in 48 seconds, or a full liter in 90 seconds. Designed to fit on wide-mouth one-liter bottles, the included 40x40 micron screen prefilter removes particulates that can get in the way of UV light. Insert the Classic 3 into the filter opening, turn the bottle upside down, and gently rock it to circulate light throughout.

SteriPEN Classic 3 Purifier with Prefilter


  • SteriPEN
  • Remove 99.9% of waterborne microorganisms
  • Ergonomic, watertight design with twist-off cap
  • LED indicators for treatment size, battery status, lamp status
  • Lamp life: 8,000 activations
  • Minimum bottle diameter: 0.8 in (2.2 cm)
  • Battery: 4 AA batteries (alkaline, lithium, or rechargeable NiMH) not included with purchase
  • Battery life (alkaline): 100 treatments (16 oz/0.5 L) or 50 treatments (32 oz/1 L)
  • Battery life (lithium): 300 treatments (16 oz/0.5 L) or 150 treatments (32 oz/1 L)
  • Battery life (NiMH): 200 treatments (16 oz/0.5 L) or 100 treatments (32 oz/1 L)
  • Dimensions: 7.3 x 1.7 x 1.7 in (18.6 x 4.3 x 4.3 cm)
  • Weight: 2.9 oz (82 g)


  • Prefilter
  • Carrying Case


All orders will be shipped by Massdrop.

Estimated ship date is Oct 27, 2016 PT.

After the drop ends, payment will be collected. To deliver the best value to the group the request will then be submitted to the vendor up front, making all sales final. Be sure to check the discussion page for updates.