WEMCO® Hydrogritter® Grit Removal System How it works Step 2The Hydrogritter® grit removal system can process from 220 to 1570 gpm at a pressure of 5 to 20 psi, which allows for a grit withdraw rate of ¾ to 8½ tons per hour at a 1 percent concentration (per cyclone). Step 1 A rugged, abrasionresistant WEMCO® TorqueFlow® pump pulls