Cartridge is designed for use with the Katadyn MyBottle Personal Water Bottle Purifiers. The Katadyn Cyst Filter removes cysts such as Giardia, and Cryptosporidium. Cartridge has a 1 micron rating. Changing the Cyst filter regurally will extend the life of your Katadyn MyBottle water bottle purifier and ensure the optimal performance in cyst and pathogen removal. Great for camping, hiking, and survival situations. Fits our MyBottle Purifier, Item # CAMP-198.