Patent ID: 7566399

Claim:
A water purifier comprising: a base having an inlet and an outlet; an outer casing mounted on the base and having a side wall, the side wall forming a filtering chamber and having an open top end, the filtering chamber communicating with the inlet of the base; a fresh water conduit demountably mounted in the filtering chamber of the outer casing and having a conduit wall and a transporting channel defined by the conduit wall, the conduit wall having multiple through holes communicating with the outlet of the base through the transporting channel; multiple filtering units demountably mounted on the fresh water conduit in a cascading manner, each of the filtering units comprising a membrane bag with a central hole to hold the fresh water conduit, and multiple supporting members, each of the supporting members being mounted between a pair of the adjacent membrane bags; a cover demountably mounted on the outer casing to cover the top open end of the outer casing; and a pre-filtering device comprising: an inner casing disposed in the outer casing around the filtering units and formed with a top; a case assembly detachably disposed in the top of the inner casing; and a filtration substance held with the case assembly.