DESC: The Exstream XR employs Virustat technology to remove all types of microorganisms, including viruses, and carbon fibers. The purification system is simple to use, there is no hassling with unpacking, assembling, pumping or separate containers. You simply fill your bottle with available fresh water. The 3 component ViruStat water purification cartridge attached to the cap inside, removes over 99.9% of waterborne cysts and protozoa like Giardia and Cryptosporidium. It also kills over 99.9999% of waterborne bacteria and 99.99% of waterborne viruses, as determined under the US EPA microbial water purification protocol. The 34 oz. bottle is designed to provide a larger volume of water for when your water source may be limited or you just have a bigger thirst. Outstanding for international travel, backcounty touring, paddle sports, fishing and extreme biking. Includes one ViruStat water purification cartridge. Removes 99.9% of waterborne cysts and protozoa. Kills 99.9999% of waterborne bacte