Patent ID: 9248391
Filing Date: 2016-02-02
CPC Classification: B01D,C02F

Claim Text:
1. A filter for a gravity-fed water treatment device comprising: a filter cartridge housing having a housing upper portion with an upper interior volume and a plurality of side apertures for untreated water ingress, and a housing lower portion with a lower interior volume, the housing lower portion having an opening therein for treated water egress, said filter cartridge housing having a predetermined length such that said housing upper and lower portions join at a mating point intermediate said predetermined length; a filter cartridge containing filter media and extending from the housing lower portion beyond said mating point into the upper portion, said filter cartridge having a central opening defining an inner wall, a first cap disposed on a top of the filter cartridge and a second cap disposed on a bottom of the filter cartridge, both caps having a central opening therein aligned, at least in part, with said filter cartridge central opening; said first cap extending about the filter cartridge top; said second cap extending about the filter cartridge bottom; and a vent tube slideably attached to said filter cartridge housing upper portion, extending through said upper interior volume to said first cap, the vent tube having a vent tube outlet disposed upwardly a predetermined distance such that air is vented from the housing lower portion lower interior volume through the vent tube and the vent tube outlet, the vent tube extendable beyond said filter cartridge.