intermediate member means arranged between said cover and base members to divide said filter chamber into a plurality of filter subchambers, said intermediate member means having planar surfaces arranged adjacent said cover and base member planar surfaces, respectively, {HEAD ~ a portion} of said {TAIL ~ intermediate member} means containing a plurality of segmented circular concentrically spaced throughslots corresponding with said cover and base member circular grooves 
of
intermediate member means arranged between said cover and base members to divide said filter chamber into a plurality of filter subchambers , said intermediate member means having planar surfaces arranged adjacent said cover and base member planar surfaces , respectively , { HEAD ~ a portion } of said { TAIL ~ intermediate member } means containing a plurality of segmented circular concentrically spaced throughslots corresponding with said cover and base member circular grooves
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