Abstract: An in-line, inclined strainer device in which the strainer proper is removably mounted within a casing, which casing is mounted in-line in a piping system, such that the strainer may be removed in an easy manner for subsequent replacement and/or cleaning. The strainer is mounted by a removable tubular element having an elliptically-cut end for mounting directly to it an elliptically-shaped screen mesh forming the strainer proper. The end of the tubular element is mounted in a linear portion of a casing through which flows the liquid of the piping system, so that the screen mesh may entrap solids. Diametrically opposite to the tubular element is a drainage duct which, when opened, allows the flow of the liquid to pass through, carrying away with it the effluent sedimented and debris in the drainage duct. The strainer proper includes a plurality of rods that are welded to the lower end of the tubular element, which rods directly mount the screen mesh.