Abstract: A hydrocyclone having a primary vessel with multiple inputs, a removable wide mouth top provided with a splash shield and adjustable atmospheric pipe, and quick open-close clamps for making the top quickly removable from and reattachable to the hydrocyclone vessel. A removable apex cone together with changeable wear plate is provided for the outlet and operating opening of the hydrocyclone. A removable vortex finder is also provided together with adjustable holddown rods provided on the top cover plate for maintaining the vortex finder in proper position within the vessel.