Siphon MicrofilterThe Katadyn Siphon turns any water container into a gravity fed microfiltration system. Simply place the ceramic filter (hose attached) into the container, place the container on higher ground, and let the siphon action take care of the rest. That's it! Filters 1. 2 gallons hour. The Siphon is a member of Katadyn's exclusive Endurance Series, which basically means this filter will last forever. Its silver impregnated, cleanable ceramic element will