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.