I used a steripen through Turkey, the 'Stans, Russia and Ukraine.
I mostly used it on water from hotels and other sources where the water was clear but not necessarily fit to drink. I used it a few times on water taken from streams- again clear water.
The unit is easy to use (read the directions!) and worked reliably- at least I did not get sick from water on the 3 month trip.
Take a few sets of extra batteries, the size they use (Lithium CR123A) were not easy to come by.
..........shu
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