Importance

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Abstract

A filtering device includes a hollow body, a filtering core assembly securely received inside the body and composed of an outer filtering core and an inner filtering core securely received inside the outer filtering core. A first switch device is mounted at a bottom end of the body and operably connected to a bottom of the filtering core assembly. A second switch device is mounted at a top end of the body and operably connected to a top of the filtering core assembly. A first chamber is defined between an inner face of the body and an outer periphery of the outer filtering core. A second chamber is defined an inner periphery of the outer filtering core and an outer periphery of the inner filtering core. A third chamber is defined inside the inner filtering core, wherein the first switch device controls communication between the first chamber and the second chamber.

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First Claim