Mary Louise Peacock

US Patent:

20080164221, Jul 10, 2008

Filed:

Feb 8, 2008

Appl. No.:

12/028260

Inventors:

Jerry Brownstein - Issaquah WA, US
Kathy Brownstein - Issaquah WA, US
Brent Hepner - Maple Valley WA, US
Mary Peacock - Gig Harbor WA, US
Herb Pearse - Gig Harbor WA, US

International Classification:

B01D 35/30
B01D 37/00

US Classification:

210767, 210435

Abstract:

A multi-layer filter sock is fabricated from materials selected to preferentially remove certain contaminants. For example, a first layer of the filter sock removes relatively fine particulates (such as rust), and another layer removes hydrocarbons. One exemplary hydrocarbon filter material can be made from delustered synthetic fibers. In one exemplary embodiment, the multi-layer filter sock includes an inner pre-filter layer configured to remove relatively larger particulates, another layer configured to remove relatively finer particulates, and a hydrocarbon removing layer. Such a filter sock can be used to remove rust from waste water used to flush fire suppression sprinkler systems, and particulates and hydrocarbons from waste water from underground vaults, enabling such waste water to be discharged directly into the ambient environment.