[banditpowdercoat]

The impellers need a cleaning. Submersable pumps usually have no constant direction. They will run both Clockwise and Counterclockwise. When you take the pump apart, you will notice the impeller seems loose on the rotor. It will spin almosty all way around, then catch. This is si the rotor can start turning. When the impeller gets crudded up, it wont spin freely on the rotor and the rotor will just hum back and forth. It needs the "slop" to get the rotor to start spinning in a direction. Clean it out, make sure the impeller flipps freely, and all will be good. I usually have to celan my Mag, Quiet one and Odesea pumps about every 6 months