Multi-layered filter apparatus

Claim 1

A FILTER FOR WATER COMPRISING: (A) A CYLINDRICAL CONTAINER OPEN AT THE UPPER END AND CLOSED AT THE LOWER END BY A LOWER END WALL BULGING DOWNWARDLY AND HAVING AN OUTLET CONDUIT COMMUNICATING WITH THE LOWER END OF SAID CONTAINER BY MEANS OF A PORT IN SAID BOTTOM WALL; (B) A SCREEN NORMAL TO THE AXIS OF SAID CONTAINER AND POSITIONED ADJACENT THE LOWER END OF SAID CONTAINER, SAID SCREEN BEING OF RELATIVELY FINE MESH; (C) WATER SOFTENING MATERIAL IN PERMEABLE FORM FORMING A LAYER ABOVE SAID SCREEN; (D) A LAYER OF FILTERING MATERIAL OF APPROXIMATELY 40MESH ABOVE SAID WATER SOFTENING MATERIAL IN PERMEABLE FORM AND EXTENDING IN THICKNESS APPROXIMATELY 1/4 OF THAT PORTION OF THE CONTAINER CONTAINING FILTERING MATERIAL; (E) A LAYER OF FILTERING MATERIAL ABOVE SAID 40-MESH MATERIAL OF APPROXIMATELY 30-MESH AND OF A THICKNESS APPROXIMATELY 1/8 OF THAT PORTION OF THE CONTAINER HAVING FILTERING MATERIAL; (F) A LAYER OF FILTERING MATERIAL ABOVE THE LAST MENTIONED LAYER OF FILTERING MATERIAL, SAID LAYER OF MATERIAL BEING OF APPROXIMATELY 20-MESH AND EXTENDING IN THICKNESS OF APPROXIMATELY 1/8 OF THAT PORTION OF THE CONTAINER HAVING FILTERING MATERIAL; (G) A TOP LAYER OF FILTERING MATERIAL OF APPROXIMATELY 10-MESH, SAID TOP LAYER BEING OF A THICKNESS APPROXIMATELY 1/4 THE EXTENT OF THE PORTION OF THE CONTAINER HAVING FILTERING MATERIAL, SAID FILTERING MATERIAL COMPRISING A MIXTURE OF 15 TO 20 PERCENT OF GRANITE, 1/2 TO 1 PERCENT OF NICKEL, 1 TO 2 PERCENT MAGANESE, 2 TO 5 PERCENT MAGNESIUM, 1 TO 3 PERCENT TITANIUM, 10 TO 20 PERCENT OF IRON, 10 TO 15 PERCENT OF ALUMINUM AND 20 TO 30 PERCENT OF SILICON; (H) AND A TOP SCREEN OF RELATIVELY COARSE MESH AND DISPOSED ON THE TOP OF THE TOP LAYER OF FILTERING MATERIAL.