Abstract: A multi-stage separation device for separating a first fluid from at least one other second substance, the first fluid and second substance forming a flowable system of substances. The device comprising a housing having a substantially cylindrical form about a central axis with a wall disposed between a first end and second end, and an inlet disposed near said first end of the housing and an outlet in the second end. The wall when viewed in cross section perpendicular to the central axis has an ever decreasing radius spiraling between at least a first edge of said wall and a second edge of the wall. The first edge and second edge form part of the periphery of an inlet in the housing. At least one permeable cylindrical separation module is disposed within the housing.

Abstract: An apparatus for filtering polluted water in drainage systems. The apparatus comprising a housing with a collection chamber disposed in the lower portion thereof. A primary filtration assembly disposed within the housing and having an inner cavity surrounded by opposed first and second ends and by two spaced apart walls, and an open bottom allowing the inner cavity to be in communication with the collection chamber. An inlet is disposed at or near the first end for the water to enter the collection chamber and a filter screen is disposed in the sides through which the water exits the collection chamber. A deflector is disposed at or near the second end of the collection chamber to deflect downwardly the water flowing towards it. The water exiting the inner cavity passes through a separate outer cavity in an upward direction to an outlet, the outer cavity formed between the filter screen, a bottom floor and an external wall of the primary filtration assembly.

Abstract: An apparatus for filtering polluted water in drainage systems. The apparatus comprising a collection chamber for collecting the water, having a first end, a second end opposite the first end, and two sides between the ends. An inlet is disposed at or near the first end for the water to enter the collection chamber and a filter screen is disposed in the sides through which the water exits the collection chamber. A deflector is disposed at or near the second end of the collection chamber to deflect downwardly the water flowing towards it.