When chipping damp products with the Primo, the 18,000 chops per minute cutting action will reduce these products into a fine paste. This can result in the holes in the standard shredding screen becoming clogged. If this is the case, chip two branches, and this will be sufficient to unclog the screen. However, if no branches are available, you can also replace the standard screen with this multi purpose screen for leaves and damp products. This special screen will not clog.