Patent ID: 8728317

Claim:
A device suitable for treating a fluid, which device comprises an elongated foil having a length with folds spaced along the length forming a plurality of foil layers arranged in zigzag fashion, a first foil layer being connected to a second foil layer at a first end, and said second foil layer being connected to a third foil layer at a second end remote from said first end, while spacers are arranged between said foil layers, which spacer comprises a mesh-like layer, through which fluid can flow in the plane of the mesh-like layer as well as transversely to the plane of the mesh-like layer, characterized in that longitudinal sides of the first foil layer and the second foil layer are interconnected from an end up to a point spaced a predetermined distance from the first end, leaving open a passage at the first end, while longitudinal sides of the second foil layer and the third foil layer are interconnected from the first end up to a point spaced a predetermined distance from the second end, leaving open a passage at the second end and wherein the first foil layer and the second foil layer are interconnected most of the distance between ends.