Energy consumption. No grinder means the whole system can be driven by the pump motor alone which uses less power. Simpler (cheaper) construction as well.
the upper spinning thing is no longer spinning
The sprayer arms aren't driven by motors, they're driven by the force of the water coming out. So that means you probably have food particles stuck in the ports where water comes out. I'd remove the arm and clean it by hand. Use a toothpick to open up the ports.
Energy consumption. No grinder means the whole system can be driven by the pump motor alone which uses less power. Simpler (cheaper) construction as well.
the upper spinning thing is no longer spinning
The sprayer arms aren't driven by motors, they're driven by the force of the water coming out. So that means you probably have food particles stuck in the ports where water comes out. I'd remove the arm and clean it by hand. Use a toothpick to open up the ports.