Katadyn MyBottle Purifier Filter BottleKatadyn 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.