A diverter for containing and reducing the velocity of the particulate discharge from a well bore being subjected to the process of “cavitation.” The diverter has a generally conical hollow containment shell and an internal diverter assembly with replaceable wear parts wherein the flow is directed into a spiral path along the inner surface of the containment shell. The path of flow is such that the flow velocity is dissipated without impeding or obstructing the flow of particulates. Water can be injected into the flow to help prevent fine particulates from becoming airborne.