E
Elite Edition

Why is my pool return blowing bubbles?

Author

Andrew Henderson

Published Apr 05, 2026

Why is my pool return blowing bubbles?

If you are seeing a significant number of bubbles coming out of your return lines into the pool, you probably have an air leak in your filtration system. Possible sources of this problem are low pool water levels, leaks around the strainer lid, leaks in the unions or leaks in the pump seals.

What causes air in pool lines?

Air bubbles in your pool mean that air is being sucked into the line on the suction side of the pump. The pool water level is too low. The strainer pot lid isn’t on tight or its O-ring is loose/absent/compromised. The union between the valves and the pump isn’t tight or its O-ring is loose/absent/compromised.

Is air bad for pool pump?

In front of the pump, specifically – is where the air is getting in. Any void on the pressure side will leak water when the pump is on, while a void on the suction side will suck air into the system. Check to see if you have air in the pool filter. You would do this by opening the air bleeder valve on your filter.

What happens if water level is too low in a skimmer?

Water level is too low, skimmer is sucking air. Solution: Raise the water level to mid-skimmer, or high enough so that a water vortex is not drawing in air to the pipe. Skimmer weir is stuck, or objects are stuck in skimmer throat. Solution: Skimmer weirs can start to stick if the skimmer walls bow inward.

Why does my pool skimmer take in air?

Let’s start off with something so obvious that it could actually be easily overlooked. That is a water level that is so low that the skimmer (s) start gulping air in with the water. In general, the water should be between ½ and ¾ up the skimmer opening (s) so as not to take in any air at all from the pool!

What does it mean if your water pipes have air in them?

Sputtering faucets, irregular water flow and vibrating pipes may indicate that you have air in your water lines.

What happens when air is trapped in pipes?

Air caught inside pipes in the home causes annoying sputtering or coughing noises. It also causes water to splash out of taps with force rather than flow in a steady stream. While trapped air does not typically cause damage to pipes or fixtures, the sounds and fury are enough to make most people want to liberate the air.

Let’s start off with something so obvious that it could actually be easily overlooked. That is a water level that is so low that the skimmer (s) start gulping air in with the water. In general, the water should be between ½ and ¾ up the skimmer opening (s) so as not to take in any air at all from the pool!

Sputtering faucets, irregular water flow and vibrating pipes may indicate that you have air in your water lines.

What causes air in the lines of a well water system?

If the below-groundwater field where your pump draws water recedes, the result is air in the line. Too much demand on the aquifer could be the cause, but the solution might be as simple as adding a few more feet of length to the pipe running from the pump to the water below.

Air caught inside pipes in the home causes annoying sputtering or coughing noises. It also causes water to splash out of taps with force rather than flow in a steady stream. While trapped air does not typically cause damage to pipes or fixtures, the sounds and fury are enough to make most people want to liberate the air.