I just bought a steripen today and as with many stories I hear, it was defective. The sensors were whacked and it functions out of water and it doesn't function in water, if I wasn't wearing sunglasses I might have been in trouble lol. Well anyway this got me thinking if I want to rely on such a device to clean my waters on my Cdt trip. I noticed that there aren't any filters worth taking that get rid of viruses but I'd rather use a filter then the ever faulty steripen. What are the chances of encountering a waterborne virus out there? Thnx