Pump runs but there is a constant stream of air bubbles from the pool return jets.

Safety: Turn off power before opening the pump lid.

• Water level: Raise pool water to mid-skimmer height.
• Lid seal: Clean and lubricate the Onga pump lid O-ring and sealing surface. Replace if damaged.
• Unions: Tighten suction-side unions and check for drips when the pump is off; drips often become air leaks when running.
• Suction cleaner: If using a vacuum or cleaner, ensure its hose connections are tight and fully submerged.

After sealing leaks, re-prime the pump and observe the returns. Occasional small bubbles may be normal, but continuous bubbles indicate remaining leaks.