>I had giardia once, and that was enough. I drank water >treated with this device for probably three weeks total last >summer, all over Oregon, and I did not get ill.
Ive never had giardia once...I want to maintain my track record. Ive known several people who got sick because they were slackers and drank from crystal clear mountain streams without first treating their water. They didn't have a fun experience and I can tell you everybody Ive known who caught it, REALLY was emphatic about treating their water afterwards.
These people who tell you its "OK" to drink untreated mountain water are romantic fools, IMO.
Personally, I see Steripen's lack of ability to get that UV light onto the threads, lid and rim of the bottle as a potential products liability case, probably with design defect as the issue. Any microbiologist will tell you that even small amounts of pathogens left on the threads or rim of the bottle can make you sick.
Somebody ought to design a UV light purifier that will do a more thorough job and get that UV light onto the rim, inside lid and threads. All chemicals get splashed onto those areas, every 13 year old Boy Scout is taught to screw the lid on loosely, shake the bottle up good and make sure some of the chemically treated water gets splashed onto the inner lid and the outside threads.
To me, thats the basics. This Steripen thing is getting away from the basics of backcountry hygiene.
While in the relatively clean back country waters of the USA and Canada, giardia might be the worst thing you will catch. But if you go overseas and use that thing, you are risking it. Would you use Steripen in Africa, Asia, Central or South America with all kinds of deadly viruses, bacteria and protozoa in the water? Just because Steripen does a bang up job of neutralizing nasties in the bottle doesn't meant squat when their are a bunch of nasties left on the rim, threads and lid.
Wiping the threads and rim with a cloth seems like a not thorough approach to being sure pathogens are gone. Those suckers are tough...they can survive easily.
I was very excited about the UV light thing and was really excited when I got the Adventurer and later, the Journey. But when I opened them up, tried them out and read the instructions and saw all the warnings, my enthusiasm wained. I'm just old school with regard to treating my back country water. I never have been sick from drinking that water because I treat it...and I intend to keep it that way.