Shear pump is a kind of centrifugal pump, usually it is used together with mud hopper, it can mix effectively and hydrate completely the material added in the drilling fluid, save the mud material , reduce the time of configuration. If there is a pill tank or pill compartment, you must use shear pump with hopper, we called it jet shearing device. 
It has better mixing efficiency than jet mud mixer, which is composed of centrifugal pump and mud hopper.