Abstract: A filtration apparatus (10) for fluids containing solid matter and/or particles or the like is disclosed. The apparatus (10) comprises screen means (20) and barrier means (21) substantially adjacent and behind the screen means (20). The barrier means (21) has a plurality of corrugated ribs (23) with vent means (22) therein. The corrugated ribs (23) are elongate and parallel and are substantially concave corrugations when seen from the direction from where the fluid is coming while the corrugations are substantially aligned with the direction of the flow of the fluid.