Treatment:Rinse with water, or open the pump to check.

Treatment:Check if power is off or phase missing.

Treatment:Unscrew the gland bolts, start the pump, slowly tighten the gland bolts, to let a little water flow.

Treatment:Soaked with 10% oxalic acid for 30 to 60 minutes.

Treatment:Adjust the working fluid to the height of the pump axis.