3 Steps to Fix Air Bubbles in Pool Return Jets

Check the pump lid O-ring Air bubbles in return jets usually mean a suction-side air leak, and nine times out of ten it is a dry or dirty O-ring on the pump lid.

Clean and lubricate the O-ring Turn off the pump, remove the lid, wipe the O-ring and groove clean, then apply a thin layer of silicone lubricant. Re-seat the lid and tighten by hand—do not use a wrench.

Inspect the skimmer weir door and drain plug If the O-ring fix does not work, make sure the skimmer weir door is not stuck open, letting a vortex suck air. Also check the drain plug on the pump housing. If bubbles persist, you may have a cracked pipe or bad union, which requires professional repair.