Rotary lobe pumps are often used for recovering oily water with solids or corrosives because it is self-priming, is low shear and can handle abrasives. Centrifugal pumps will thoroughly emulsify oil and water making their eventual separation for disposal more difficult and hence expensive. The pumps are well suited for pumping clean bentonite into slurry walls because the low shear and low speed results in less damage. LobePro Sludge pumps are designed to handle these applications.