Abstract: The invention relates to a membrane holder, comprising a number of cartridges for holding elongate filter membranes, which cartridges have a substantially V-shaped cross-section, wherein the cartridges are connected hingedly to each other in longitudinal direction at right angles to the cross-section. The invention further relates to a method for manufacturing a filter, comprising the steps of:—providing a number of cartridges of substantially V-shaped cross-section which are connected hingedly to each other in longitudinal direction at right angles to the cross-section;—filling the cartridges with filter membranes;—rolling up the cartridges to a cylindrical form;—pushing the rolled-up cartridges into a cylindrical tube.