MULTIPLE-STAGE LIQUID FILTERING METHOD AND APPARATUS Russian patent published in 2005 - IPC

FIELD: liquid purification by filtering.

SUBSTANCE: filter for multiple-stage filtering of liquid has chamber equipped with liquid flow inlet and liquid flow outlet; first filter stage provided within said chamber and fluidly communicating with said inlet, said first filter stage comprising material for removal of microorganisms; second filter stage provided within said chamber and fluidly communicating with said outlet, said second filter stage comprising activated carbon. Second filter stage is positioned in said chamber so as to allow liquid to flow through first filter stage before it flows through second filter stage. Filter has third filter stage provided within said chamber and positioned so as to allow liquid to flow through third filter stage before it flows through first filter stage. Third filter stage is made in the form of micro fiber glass web with pores having sizes reducing in the course of flow of the liquid.

EFFECT: increased efficiency in removal of various microorganisms from liquid.

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