Garbage Disposal Blades Replacement Starts With the Right Diagnosis For most modern units, garbage disposal blades replacement does not mean swapping sharp knife-like blades. Disposals usually grind food with rotating impeller lugs and a fixed shredder ring. First, cut power at the breaker, check for a jam with the proper disposal wrench, and confirm that your exact model actually has serviceable internal parts. If the impellers, shredder ring, or grind plate are worn or dama