Patent ID: 6355171
Filing Date: 2002-03-12
Classification: B01D

Abstract:
Liquid filter apparatus for removing particulates from a liquid, the filter apparatus including a liquid vessel, at least one elongate rigid sock support suspended within the vessel to receive therein filtrate liquid from unfiltered liquid in the vessel, the sock support(s) having inflow perforations along the length thereof and an outflow opening at an end thereof, and a filter sock over and along each of the sock supports and susceptible to repeated non-supported back-washing, characterized in that the filter sock is a non-perforated non-woven filter material of flash-spun plexifilamentary polyolefin fibrils, the filter material having a thickness of less than about 0.15 mm and having a pressure drop of less than 4 psid at a flow rate of 10 gal/hr and a filtration efficiency of at least 98% of 1-2 micron particulates at a pressure differential of 30 psid.