Gusher 7550 Vortex Series: The Vortex Non-Clog Impeller is designed to handle large diameter solids and fibrous material without clogging. The Vortex Non-Clog Pumps will handle solids up to the same diameter as the discharge. There is reduced radial loading for trouble free operation. Even with low flows, the Vortex Non-Clog design allows throttling to a low performance range unacceptable to many centrifugal pumps. The complete Vortex Non-Clog line has been designed to pump various liquids and oils containing up to 30% entrained air. They will operate 23% below its first critical speed at any point of operation. The Vortex Non-Clog Pump shaft is designed to have a maximum total indicated run-out not to exceed .008 inches.