Abstract: A filter, mainly for coffee-making devices, comprises a cup-shaped cylindrical member and a circular member partially closing the top aperture of the cup-shaped cylindrical member so as to leave a filter-forming circular gap therebetween. This gap increases in width from the inner edge of the cup-shaped member inwards; the top face of the circular member may constitute the bottom of the filtration chamber. Means may be provided for adjusting the relative spacing of these members and therefore the width of the filter-forming gap. Ribs or shims may be provided on either of the two members for maintaining a permanent gap width.