Roger Reid

US Patent:

8167141, May 1, 2012

Filed:

Sep 9, 2008

Appl. No.:

12/207284

Inventors:

Elizabeth L. Knipmeyer - Pleasanton CA, US
Toni L. Lynch - Pleasanton CA, US
Roger P. Reid - Caldwell ID, US
Bruce D. Saaski - Caldwell ID, US

Assignee:

Brita LP - Oakland CA

International Classification:

B01D 27/02
B01D 39/02
B01D 24/00

US Classification:

210464, 210266, 210282, 210486, 2105021, 210283

Abstract:

A gravity-fed carbon block water filter in one embodiment includes a filter block comprising multiple sub-blocks each comprising filter media walls surrounding and defining a cavity for receiving fluid. Each of the sub-blocks is connected to at least one other of the sub-blocks by filter media of which the filter block is made. In one approach, the filter media includes about 20-90 wt % activated carbon, and about 5-50 wt % binder. In another approach, a lead concentration in a final liter of effluent water filtered by the filter is less than about 10 μg/liter after about 151 liters (40 gallons) of source water filtration, the source water having a pH of 8. 5 and containing 135-165 ppb total lead with 30-60 ppb being colloidal lead greater than 0. 1 μm in diameter. A gravity-fed water filter in other embodiments has no specified shape but achieves a FRAP factor of about 350 or less.