Abstract: The invention relates to a device for filtering on a substantially horizontal plane, comprising a filter cloth (50) and a structure (51) for supporting the filter cloth capable of tilting about a horizontal axis (47) and comprising a peripheral groove (48) of uniform cross-section. The cloth is fastened to the support by a hollow tubular gasket (55) made of elastic or substantially elastic material, arranged to interact with the groove; the tubular gasket is designed to distort transversely between a free or contracted state in which it can be easily introduced into the groove into which the filter cloth has been inserted beforehand, and a distorted or dilated state in which it locks the cloth inside the groove by pressure.