How to Fix / Troubleshooting

Safety first: Do not run the pump for long periods while cavitating; it can damage the impeller and housing.

Check water level: Ensure the pool water level is adequate and that skimmers are not drawing air.
Inspect suction piping: Minimize elbows and restrictions near the pump. Ensure valves are fully open.
Seal air leaks: Check and reseal the pump lid O‑ring and suction unions. Tighten all fittings.
Reduce speed: If using a variable‑speed Lowara pump, reduce the speed to lower suction demand.
Re‑evaluate installation: If cavitation persists, consult a pool professional to review pump sizing and suction design.

Pump makes a loud rattling or clattering noise, especially at high flow

Possible Causes