Profile: Greig Filters, Inc. specializes in filtration of completion fluids used in oil and gas completions, brine disposal & industrial filtration. We offer several models of diatomaceous earth precoat vertical pressure leaf filters and cartridge filter systems to suit a variety of needs. We supply filter leaf manufacturing & reconditioning for a variety of types of pressure leaf filters. Our oilfield skid filter packages feature high rate-high capacity filtering of completion fluid. We also deal in pressure leaf filters for numerous industries.