Onga Cavitation Due to High Suction Lift or Restriction

Pump is unusually loud with a cavitation sound (gravelly, crackling) and reduced flow.

This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.

If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.

Possible Causes

Blocked suction, undersized suction pipe, excessive lift from water level to pump, dirty filter

Safety: Turn off power before servicing.

Reduce restriction: Clean all baskets and backwash or clean the filter.
Check suction design: Ensure the Onga pump is installed as close to water level as practical and that suction pipe size meets Onga specifications.
Open valves fully: Partially closed valves on suction or return can increase cavitation.

Persistent cavitation can damage the impeller and housing; consult a pool professional if system design changes are needed.

Medium 3/5