SteriPEN Pre-Filter

After buying Steripen, I still boiled my water for awhile, but now have total confidence in this product. Couldn''t be easier to use. Now I''m saving lots of stove fuel and drinking healthy water. The prefilter is a MUST in combination with the Steripen. Clear, clean water.

I love how it works and I really trust it to work every time. Can''t say much more about it since it is so simple. My only advice is to try one on your bottle first. Mine fit nalgenes like a glove, but on my camelback, it is really tight. Still works fine, but a little harder to use. I keep mine in a ziplock when I''m on the trail, not on the bottle. You can leave it on, you just have to try a few different ways.

Also, when it is dry, it does not work! You have to wet it and it will flow very fast. It will stay wet on the trail after the first use. Not a flaw, it is just a very fine mesh in the filter.

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I used this product on a hike of the Long Trail in Vermont last fall with the SteriPEN Journey LCD Ultraviolet Water UV Purifier. If you end up having to drink water from a murky source, then this product will do a great job of keeping the sediment out. If the Steripen is your solution to water purification, then I would definitely recommend bringing the prefilter along it will definitely increase the quality/taste of the water you end up drinking.

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It took me several tries before I figured it out but once you know what to do, it works well. I bought this to go with the SteriPEN. Now I feel secure drinking water from the lakes and streams.s

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Used this for a couple days on a backpacking trip in Colorado. The water we filtered was clean to begin with, but this adds some reassurance on top of the steripen. It makes a very tight (maybe too tight) seal with my nalgene.