The pump is running, but large amounts of air bubbles are visible at the pool return.

Safety first: Turn off and unplug the pump before tightening fittings.

Steps:

• 1. Check water level: Ensure the pool water level is at least halfway up the skimmer opening so the Flowclear skimmer does not draw air.
• 2. Inspect suction hose: Examine the hose from the pool to the pump for cracks, pinholes, or loose connections. Replace damaged hoses and tighten hose clamps on Flowclear adapters.
• 3. Pump lid seal: Remove the pump lid, clean the O-ring and sealing surfaces, and apply a thin layer of pool-safe silicone lubricant. Reinstall the lid firmly.
• 4. Check fittings: Tighten all threaded and quick-connect fittings on the suction side. Use Teflon tape on threaded connections if they are seeping air.
• 5. Re-prime: Fill the pump housing with water and restart. Observe the return; a small amount of residual air is normal initially, but bubbles should diminish.