Patent ID: 8216462

Claim:
A portable water filtering and purifying apparatus comprising: (a) a first chamber having an entrance into which water to be made potable may be drawn by suction induced by negative pressure, (b) a second chamber having an inlet into which the water in the first chamber can be forced by a pumping action creating positive pressure, and an outlet, (c) a mouthpiece mountable over the outlet of the second chamber (d) a micro-filtering substance positioned within a section of the second chamber through which water can be forced by said pumping action to an outlet for purified water, said micro-filtering substance detachably secured to the mouthpiece, (e) a macro-filter or micro-filter disposed for preliminary filtration of water prior to being drawn by suction into the first chamber by said negative pressure, (f) a macro-filter disposed at the inlet of the second chamber for preliminary filtration of water being forced into the second chamber by positive pressure, (g) said mouthpiece additionally comprising a threaded connection between said second chamber and mouth piece; and a sealing member provided on the outer surface of said mouth piece, whereby said mouth piece is mountable to the second chamber in a reverse orientation such that the outer surface of the mouth piece is at least partially inserted into the second chamber, and a seal is created between the inner surface of said chamber and the sealing member allowing water to be pumped through the mouth piece and micro filtering substance in a reverse direction to remove debris clogging said substance.