Dual media filter element

Claim 1

A FILTER ELEMENT COMPRISING: A PERVIOUS CENTER TUBE, A PAIR OF RADIALLY CONTIGUOUS FILTER MEDIA AROUND SAID TUBE, THE INNER OF SAID MEDIA COMPRISING A TUBE OF LONGITUDINALLY PLEATED PAPER OF A DENSITY TO REMOVE EVEN MINUTE PARTICLES OF SOLIDS, THE OUTER OF SAID MEDIA BEING OF DIMINSHING POROSITY AND LESS DENSE THAN SAID PAPER TUBE BUT CAPABLE OF EFFECTIVE REMOVAL OF LARGER MASSES INCLUDING SLUDGE AND SLIME-FORMING SUBSTANCES AND COMPRISING A HONEYCOMB WINDING OF A PLURALITY OF SUPERPOSED CRISSCROSS LAYERS OF CONVOLUTIONS OF A FUZZY YARN WITH THE INNERMOST LAYER INTIMATELY WOUND ON THE OUTER FOLDS OF THE PLEATS OF SAID PAPER TUBE IN AXIALLY SPACED RELATION, SAID WINDINGS PROVIDING FILTERING TUNNELS EXTENDING FROM THE OUTER SURFACE OF THE OUTER MEDIUM TO THE INNER MEDIUM, SAID YARN HAVING FIBERS WHICH EXTEND ACROSS THE TUNNELS AND FORM A PLURALITY OF FILTERING LAYERS IN EACH TUNNEL, AND MEANS SEALING OFF THE ENDS OF SAID PLEATED PAPER TUBE TO COMPEL ALL LIQUID TO BE FILTERED TO PASS THROUGH SAID OUTER HONEYCOMB FILTER MEDIUM BEFORE REACHING SAID PAPER TUBE.