Metal fiber web based filter

A filter membrane comprising at a flow in side of the filter membrane a first metal fibre web selected to act as filter medium, wherein said first metal fibre web comprises at least two metal fibre layers, a fine fibre layer and at least one coarser fibre layer, wherein the fine fibre layer is located at the flow in side of said filter membrane and the at least one coarser fibre layer is located downstream of said fine fibre layer,

• said filter membrane further comprising at a flow out side of the filter membrane, a stack of one or more first two-dimensional metal structures that have constant and regular openings,
• said filter membrane further comprising at least one set formed by a second metal fibre web and a stack of one or more second two-dimensional metal structures with constant and regular openings, wherein said at least one set is provided in between on one side said stack of one or more two-dimensional metal structures that have constant and regular openings, and on the other side said first metal fibre web,
• wherein the second metal fibre web is in direct contact with the stack of one or more first two-dimensional metal structures,
• wherein one of said stacks of one or more second two-dimensional metal structures with constant and regular openings is in direct contact with the first metal fibre web at the side of said at least one coarser fibre layer;
• and
• wherein said one or more first two-dimensional metal structures, said first metal fibre web, and said at least one set of second metal fibre web and one or more second two-dimensional metal structures;
• are all connected to each other by means of metallic bonds.