The planar faces of the base and cover members adjacent the intermediate member each contain {HEAD ~ a plurality} of {TAIL ~ concentrically spaced circular grooves} and a radial conduit affording communication between the grooves, whereby fluid is distributed across the planar faces of the base and cover members adjacent the planar filter members 
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The planar faces of the base and cover members adjacent the intermediate member each contain { HEAD ~ a plurality } of { TAIL ~ concentrically spaced circular grooves } and a radial conduit affording communication between the grooves , whereby fluid is distributed across the planar faces of the base and cover members adjacent the planar filter members
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