The Dimminutor open-channel grinder reduces wastewater solids in open-channel installations. It features a high-capacity, low head loss design. It also features individually replaceable hardened stainless steel cutters, a heavy-duty stainless steel semi-circular screen, submersible explosion-proof motor, an S250 automatic reversing controller, and a choice of channel frames for easy installation and maintenance. There are no seals or bearings at the channel bottom.