Mixing and blending are critical to a successful pulp/paper mill operation. The mass concentration of the pulp suspensions in chests must be uniform at all locations. This is typically done with efficiency impellers, along with a properly sized agitator and proper chest design. One method used to provide uniformity in the momentum method is Top Mounting. Top-mounted agitators are widely used in many main processes in pulp and paper production and in the wastewater treatment plant. The most demanding applications are in the recovery plant.