"Great for small volume and relatively clean water"
Got this item with some of my rewards points so it was basically a freebie, and for that price this product is great. So far i have used it on 8 trips (1 to 2 days) and i have yet to get sick. Obviously it does not filter the water so be wary of your water source, but a little silt never killed anyone (i think). For personal use this works as intended and it pretty convenient if the right setup is used. When you need to clean water for 2 or more people it can get annoying since it takes 90 sec to clean 1 liter. For 2 people with two 3 L bladders thats 9 minutes, but probably more because time because it takes time in between each cleaning cycle and pouring the water from a 1 L container to the bladder..it adds up and get annoying. So for treating large amounts of water you may want to consider something else. Also remember this is an electronic device and it takes batteries ..it can give out and leave out high and dry ..have a backup plan! Hike smart!
This was a life saver on our trip to Yosemite this summer. We experienced warmer than expected temperatures and ran out of water. Thanks for the Merced River and our SteriPEN we had an endless water supply. Very easy to use! Take it on all of our hikes just in case. Nice extra for additional security.