Abstract: An electrically augmented crossflow filter device in which a feed stream containing solid particulate matter is flowed between opposed walls while a pressure differential is imposed across a first of said walls comprising a filter medium to produce a flow of filtrate therethrough in a direction perpendicular to the direction of flow of the feed stream. At the same time, an electric field is imposed on the feed stream in a direction perpendicular to the direction of the flow of the feed stream, causing the solid particulate matter in the feed stream to tend to move toward the second of said walls which comprises an ion-pervious member. Cake formation on the latter ion-pervious wall is limited or precluded by the velocity of the feed stream while the feed stream thickens in passing between the walls to form the product stream. The electrode which is located behind the second, or ion-pervious, wall is immersed during operation in a protective stream of a selected electrolyte.