Convert your old Katadyn Base Camp Water Filter to the new Ultra Flow(TM) filter element with the Upgrade Kit. It doubles the capacity of the old filter system. The Upgrade Kit includes the 0.2 micron Ultra Flow pleated glass fiber filter element, filter cap, quick-release hose attachment and carry bag. A cleanable filter protector lengthens the lifetime of the filter element so it can clean up to 400 gallons (1500 liters) of water. There's a one-year AntiClog(TM) Guarantee on the filter element. Katadyn warrants your Ultra Flow Filter Element to be free from defects that cause the filter to clog.