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GN mud agitator impeller is fixed to the shaft with bolts to avoid rotating or sway (connection with key groove optional). Its vertical location on the shaft is determined as a height from the tank bottom corresponding to the impeller diameter times 0.75. For example, a 20” impeller should be mounted 15” above the bottom. GN recommends straight impeller blades for tanks under 5’ deep and canted blades for deeper tanks. If dual impellers are desired, straight blades are mounted on the bottom and the canted blade impeller is installed at a point about two-thirds above the tank bottom.