Waterway pool pump emits a high‑pitched whining noise that increases with speed.

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

• Check for air leaks: Inspect the pump lid o‑ring, suction unions, and fittings for air bubbles under the lid while running. Fix any leaks as described in lid and fitting leak sections.
• Reduce speed: On Waterway variable‑speed pumps, lower the RPM and see if the whining decreases. Program a lower maximum speed if necessary.
• Clear suction restrictions: Clean all baskets and check suction lines for obstructions.
• Evaluate plumbing: If cavitation persists at moderate speeds, consult a pool professional to evaluate suction pipe size and layout relative to pump size.