... and circulate back to Aeration Tank.(2)Feed Pumps & Flushing Pumps are automated by Control Panel for normal operation ... 5 modes of operation: Normal Operation, Forward Flushing, Backward Flushing, Air Flushing, CIP Flushing.(5)All the modes above are performed ... repeated cycle with adjustable frequency & duration, except CIP Flushing (only needed periodically)(6)Discharge of waste from the ...