Dave and Deb of The Planet D are in Kyrgyzstan on a two day horse trek showing you how they sterilize their water when trekking, camping and traveling. The Steri Pen is a portable water purification system that can be used anywhere. Need water in your hotel room in a developing country where you should never drink it? You can get it right from the tap! It also comes with a filter if you have very gritty or dirty water so you can filter it before purifying it withe the Steri Pen.