U.S. Motors pool pump emits a loud cavitation or gravelly sound, especially at higher speeds; pump basket may show swirling air.

Safety first: Turn off power before adjusting valves or plumbing.

• Open suction valves fully: Ensure all suction-side valves are completely open.
• Reduce pump speed: On U.S. Motors variable-speed pumps, lower the RPM until the cavitation noise subsides while still maintaining adequate flow.
• Check suction line sizing: Verify that suction plumbing meets recommended diameter for the pump's flow rate. Consider upgrading undersized lines during future renovations.
• Minimize suction lift: If possible, lower the pump closer to water level or reduce suction run length.
• Eliminate suction restrictions: Clean baskets and check for obstructions in suction fittings.