I have been told that Berkeley had an accessory that installed on the impeller shaft that cuts grass that would go into the suction piece. I went to green lake A.K.A. Clear lake and spent hours with a fillet knife cutting grass out of my intake one weekend. I also sucked up a ski rope and I had to be towed to the ramp and cut the rope off the shaft with the same knife. Does anyone know where I can find one of those cutter blades?