Katadyn's MyBottle Purifier is the ingenious drinking bottle with an integrated virus filter. It enables the purification of drinking water at any time and anywhere there's no need for pumping. Ideal for small quantities, e.g. when hiking, traveling or playing sport. A fiberglass pre filter removes bacteria and protozoa as well as particles larger than 0.3 microns The new 3 layer filter medium ViruPur blocks viruses and the smallest particles based on electrokinetic depth filtration. The MyBottle doesn't require chemicals or batteries.