I've used (use) just about everything out there. I recently purchased a Steripen Ultralight UV device. I've owned a Steripen Adventurer for almost 10 years and it's worked flawlessly, but it uses CR123 batteries while most of my headlamps use AAA's. I dislike carrying multiple types of batteries. They recently came out with the Ultralight, at a svelte 2.5 oz. It's rechargeable and as I carry a small charger anyways I thought I would give it a go. I also picked up a few rechargeable headlamps too recently, so some trips carrying no batteries.

I like that the UV as imparts no taste (unlike tabs), can't clog, kills everything (it's what municipalities use) and takes 90 seconds to treat a liter of water. I still carry Aquatabs for backup, they weigh nothing.

You do need to use a wider mouth bottle for UV (has to be big enough to put the device in and swirl the water), but I recently went back to Nalgenes, so that's not a problem for me.



[Linked Image from imgur.com]