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The SteriPen Freedom with its 75 grams is currently the lightest UV pen from SteriPen. We will use this UV pen in combination with a ceramic water filter to clean the water from possible viruses as well.
The Steripen Freedom weighs only 75 grams and rechargeable via USB (e.g. with a rechargeable USB battery which you can take on your trip) and is supposed to clean water of bacterias.
I have used the Steripen Freedom in combination with a ceramic filter in order to achieve the best results. I have tested the Steripen Freedom on our trip to Sarek in Sweden. However, water filters are in most cases not really needed there but it’s still good to filter particles out with a ceramic filter.