Pump basket does not fill completely with water; visible swirling and air pocket remain.

Safety first: Turn off power before opening the pump or adjusting plumbing.

• Verify installation height: If the pump is significantly above water level, some air pocket may be normal, but should not cause loss of prime.
• Improve sealing: Replace the pump lid O-ring and ensure unions are properly sealed.
• Reduce restrictions: Open all suction valves and clean baskets to reduce suction lift.
• Monitor performance: If circulation is adequate and the pump does not lose prime, a small air pocket may be acceptable. Otherwise, continue leak detection.