A filter for filtering particles in a container of fluid, the filter comprising: a flow director comprising a hub , a plurality of radial blades extending from the hub and a plurality of vanes concentric about the hub , the blades and the vanes intersecting to form a grid having a first face , an opposed second face , and a perimeter , the radial blades and concentric vanes collectively defining a plurality of openings formed therebetween, each opening extending between the first face and the second face where a cross-sectional area of each opening decreases from the first face to the second face ; and a skirt coupled to the perimeter of the flow director for maintaining the flow director in spaced relation from a bottom of the container , the skirt compartmentalizing the container so that the flow director acts as a divider between fluid above and below the flow director , wherein the skirt and an outermost concentric vane are spaced apart to form a fluid return region therebetween, the fluid return region including fluid return passageways allowing fluid directed to the fluid return region to flow from a position below the flow director to a position above the flow director , wherein the decrease in cross-sectional area of the openings in the grid helps to prevent particles from travelling from a position below the flow director to a position above the flow director , and wherein the fluid return passageways have a bottom rim formed by the outermost concentric vane and a top rim formed by the skirt , such that as fluid travels upwardly through the fluid return passageways , drag exerted on the fluid by the bottom rim helps to direct fluid downwardly back through the flow director . a flow director comprising a hub , a plurality of radial blades extending from the hub and a plurality of vanes concentric about the hub , the blades and the vanes intersecting to form a grid having a first face , an opposed second face , and a perimeter , the radial blades and concentric vanes collectively defining a plurality of openings formed therebetween, each opening extending between the first face and the second face where a cross-sectional area of each opening decreases from the first face to the second face ; and a skirt coupled to the perimeter of the flow director for maintaining the flow director in spaced relation from a bottom of the container , the skirt compartmentalizing the container so that the flow director acts as a divider between fluid above and below the flow director , wherein the skirt and an outermost concentric vane are spaced apart to form a fluid return region therebetween, the fluid return region including fluid return passageways allowing fluid directed to the fluid return region to flow from a position below the flow director to a position above the flow director , wherein the decrease in cross-sectional area of the openings in the grid helps to prevent particles from travelling from a position below the flow director to a position above the flow director , and wherein the fluid return passageways have a bottom rim formed by the outermost concentric vane and a top rim formed by the skirt , such that as fluid travels upwardly through the fluid return passageways , drag exerted on the fluid by the bottom rim helps to direct fluid downwardly back through the flow director . <EOS>