Abstract: A device for filtering and separating a flow medium by reverse osmosis, micro filtration, ultra filtration, or nano filtration has a pressure-tight housing having an inlet for the flow medium and a first outlet for the retentate and a second outlet for the permeate. A plurality of stacked units comprised of spaced apart membrane filter elements is provided, wherein the membrane filter elements are stacked atop one another to form a stack. The stacked units are sequentially arranged in the housing. The flow medium flows in sequence through the stacked units. Each one of the membrane filter elements includes areal outer membrane elements and an areal stabilizing element positioned between the areal outer membrane elements.

Abstract: A device for filtering and separating a flow medium by reverse osmosis, microfiltration, ultrafiltration or nanofiltration has a pressure-tight housing with an inlet for the flow medium and a first outlet for the retentate and a second outlet for the permeate. A plurality of stacked units comprised of spacer elements and membrane filter elements is provided. The spacer elements and the membrane filter elements are stacked alternatingly atop one another to form a stack. The stacked units further comprise two receptacle parts forming a receptacle for enclosing a stack of spacer elements and membrane filter elements. The stacked units are positioned adjacent to one another in the housing. The flow medium flows in sequence through the stacked units.

Abstract: An apparatus for filtering and separating flowing medium by reverse osmosis, ultrafiltration, and microfiltration. Disposed in a closed housing is an element stack comprised of disk-shaped spacers and filter elements, with a respective filter element being disposed between each two spacers, about which the flowing medium flows. The housing has a spherical configuration.

Abstract: A spacer for guiding flowing medium, especially in apparatus for filtering and separating flowing medium via reverse osmosis and ultrafiltration. The spacer has a central hole that essentially serves for the clamping together of a plurality of disk-like spacers. A filter element is disposed between each two spacers, with flowing medium flowing about both sides of the filter element. To reduce pressure loss in the flowing medium, a plurality of spaced-apart openings through which flowing medium passes are disposed about the central hole of the spacer.