A pump, comprising: a pump casing having an inlet and an outlet formed therein; a drive unit with a drive shaft extending axially through said pump casing; an impeller connected to said drive shaft and positioned within said pump casing; a radial cutter ring assembly positioned adjacent said inlet of said pump casing and said impeller, said radial cutter ring assembly configured with a plurality of side shear slots arranged on a radial cutter ring surface of said radial cutter ring assembly; a cutter bar connected to said drive shaft, said cutter bar configured with one or more cutting blades located on an edge disposed adjacent said radial cutter ring surface and an upper surface substantially planar; an axial cutter ring assembly configured to provide a shredding cutting action of the solid performed by said cutting blades rotating past said radial cutter ring surface of said radial cutter ring assembly, said axial cutter ring assembly comprising an outer ring and an inner; a housing; the pump further characterized by the impeller having a plurality of vanes configured to direct liquid radially towards said outlet; the axial cutter ring assembly comprising an outer ring and an inner ring connected by one or more blades forming openings between said outer and inner rings (122, 123) adapted for the passage of solids from said inlet to said outlet, said axial cutter ring assembly having an axial cutting surface disposed substantially parallel to said upper surface of said cutter bar, said axial cutter ring assembly disposed between said impeller and each of said radial cutter ring assembly and said cutter bar; the housing configured to adjust a predetermined dimension between said axial cutting surface disposed substantially parallel to said upper surface of said cutter bar so as to adjust a shearing cutting action of the solid performed by edges of an upper surface of said cutter bar and a surface of one or more blades of said axial cutter ring assembly sliding past one another. a pump casing having an inlet and an outlet formed therein; a drive unit with a drive shaft extending axially through said pump casing; an impeller connected to said drive shaft and positioned within said pump casing; a radial cutter ring assembly positioned adjacent said inlet of said pump casing and said impeller, said radial cutter ring assembly configured with a plurality of side shear slots arranged on a radial cutter ring surface of said radial cutter ring assembly; a cutter bar connected to said drive shaft, said cutter bar configured with one or more cutting blades located on an edge disposed adjacent said radial cutter ring surface and an upper surface substantially planar; an axial cutter ring assembly configured to provide a shredding cutting action of the solid performed by said cutting blades rotating past said radial cutter ring surface of said radial cutter ring assembly, said axial cutter ring assembly comprising an outer ring and an inner; a housing; the pump further characterized by the impeller having a plurality of vanes configured to direct liquid radially towards said outlet; the axial cutter ring assembly comprising an outer ring and an inner ring connected by one or more blades forming openings between said outer and inner rings (122, 123) adapted for the passage of solids from said inlet to said outlet, said axial cutter ring assembly having an axial cutting surface disposed substantially parallel to said upper surface of said cutter bar, said axial cutter ring assembly disposed between said impeller and each of said radial cutter ring assembly and said cutter bar; the housing configured to adjust a predetermined dimension between said axial cutting surface disposed substantially parallel to said upper surface of said cutter bar so as to adjust a shearing cutting action of the solid performed by edges of an upper surface of said cutter bar and a surface of one or more blades of said axial cutter ring assembly sliding past one another.