Pump runs but makes a rattling noise, especially when flow is restricted.

Safety first: Unplug the pump before adjusting valves or hoses.

Steps:

• 1. Ensure full water supply: Confirm that the pool water level is adequate and that the Flowclear skimmer is not drawing air.
• 2. Open valves: Fully open any suction and return valves to reduce restriction.
• 3. Check for air leaks: Inspect suction fittings, hoses, and the pump lid O-ring for leaks and correct as needed.
• 4. Adjust speed: On variable-speed models, reduce pump speed to a level appropriate for the Flowclear hose and filter size.