Patent ID: 7585409
Filing Date: 2009-09-08
Classification: B01D

Abstract:
1. A multi-stage water purification device, comprising: an untreated water compartment, the untreated compartment having an untreated water inlet; a treated water compartment, the treated water compartment being segregated from the untreated water compartment, the treated water compartment having an initial volume and being formed from a resilient material; an outlet in flow communication with the treated water compartment; a first unidirectional valve disposed between the treated water compartment and the outlet, the first unidirectional valve configured to permit flow out of the treated water compartment only; and a filter disposed between the untreated water compartment and the treated water compartment, the untreated water flowing through the filter to produce treated water, the filter having a second unidirectional flow valve at a discharge thereof configured to permit flow out of the filter and into the treated water compartment only, wherein when water is introduced into the untreated water compartment and the treated water compartment is deformed to reduce the volume therein, the treated water compartment returning to its initial volume provides a negative pressure to draw the water through the filter into the treated water compartment.