Pump runs but filter pressure is very low and returns are weak.

Safety first: Turn off power before opening the pump lid.

• 1. Clean baskets: Empty skimmer and pump baskets thoroughly.
• 2. Prime the pump: Fill the pump housing with water and ensure the lid O-ring is clean and lubricated.
• 3. Check for air leaks: Inspect lid, unions, and suction fittings as described in suction leak troubleshooting.
• 4. Isolate suction lines: Use valves to run the pump from one suction source at a time (e.g., skimmer only, then main drain only) to identify a blocked line.