The new EC regulation does not allow old knife-operated food grinders. These did not completely crush the food scraps and pieces were left that could clog the pipes. For this reason some autonomous communities and municipalities prohibited its use. Currently, most of them work with a system of grinding wheels, toothed rings or hammers that, by rotating at high speed, completely crush organic waste. In this way they avoid accidental cuts and bottlenecks in the sanitation network.