Patent ID: 8292088

Claim:
A hand pump comprising: a pump handle; a water intake; pump means responsive to motion of said pump handle for generating a liquid-draw pressure at said water intake and for applying a filtration-drive pressure to raw unfiltered water at a second pumping location within said pump means following release, at a first pumping location, of said raw unfiltered water from said liquid-draw pressure; a filter connected to receive said water to which said filtration-drive pressure is applied so as to provide filtration of said raw unfiltered water; a filtered outlet downstream of said filter to deliver filtered water; and an unfiltered outlet connected to a flow path within said pump means, said flow path providing said raw unfiltered water to said second pumping location for application of said filtration-drive pressure, said unfiltered outlet to deliver said raw unfiltered water from said first pumping location following said release from said liquid-draw pressure.