The Katadyn MyBottle Microfilter is a multi purpose filtration system. It meets EPA guidelines for removal of bacteria and protozoan cyst like Giardia. This microfilter system is easy to operate and the internal carbon filter reduces chemicals making the water taste better. Includes a drinking straw to use as your everyday bottle if the source water is already safe to drink. Great for hiking, biking, paddling or fishing. It can also be easily upgraded to a Purifier by adding the Katadyn purification cartridge sold separately.