A few small bubbles coming from your pool return jets may not seem like a big deal. But if you’re seeing a constant stream of air bubbles while the pump is running, your pool may be trying to tell you something.
In a properly operating pool system, water should circulate through the pump, filter, and return lines with very little air entering the system.
Persistent bubbles often mean that air is being pulled into the plumbing somewhere before the pump.
Sometimes the cause is simple. Other times, it can point to a plumbing or equipment problem that should be addressed before it becomes more expensive.
🔹 1. Your Pool Water Level May Be Too Low
This is one of the first things to check.
If the water level drops too low, the skimmer can begin pulling air along with water. That air travels through the pump and eventually appears as bubbles coming from the return jets.
As a general rule, the water level should normally be around the middle of the skimmer opening.
During Houston’s hot weather, evaporation can lower the water level surprisingly quickly.
If you hear your skimmer making a sucking or gurgling sound, check the water level first.
🔹 2. Your Skimmer Basket May Be Clogged
Leaves, grass, insects, pine needles, and other debris can accumulate inside the skimmer basket.
If the basket becomes heavily clogged, the pump may struggle to receive enough water.
This can reduce circulation and, in some situations, contribute to air entering the system.
The pump basket should also be checked regularly because debris there can restrict water flow as well.
🔹 3. The Pump Lid O-Ring May Be Worn
Under the clear pump lid is a rubber O-ring that helps create an airtight seal.
Over time, that O-ring can become:
- Dry
- Cracked
- Flattened
- Stretched
- Dirty
- Improperly seated
Even a very small gap can allow the pump to suck air into the system.
And here is something many homeowners don’t realize:
You may NOT see water leaking from this type of problem.
Because the pump is creating suction, air can be pulled inward instead of water leaking outward.
If you see a large air pocket underneath the pump lid while the system is running, the pump lid and O-ring are good places to investigate.
🔹 4. You Could Have a Suction-Side Leak
Air bubbles can also indicate a leak somewhere between the pool and the pump.
Possible problem areas include:
- Valves
- Unions
- Fittings
- Drain plugs
- Plumbing connections
- Underground suction lines
These leaks can be difficult to identify because they may not produce an obvious puddle of water.
Instead, when the pump is running, air gets pulled into the plumbing.
Some common warning signs include:
✔️ Persistent bubbles from the return jets
✔️ Air underneath the pump lid
✔️ Difficulty priming the pump
✔️ Inconsistent water flow
✔️ The pump losing prime after shutting off
🔹 5. Check Pump Drain Plugs and Fittings
Pool pumps usually have one or more drain plugs.
If one is loose, damaged, or has a worn O-ring, air can enter the system.
The same can happen around threaded fittings and unions near the pump.
Again, everything may look perfectly dry because the system is sucking air inward rather than leaking water outward.
🔹 6. The Skimmer Weir Door Could Be Causing Problems
The small swinging door at the front of the skimmer is called the weir.
It helps debris move into the skimmer and keeps it from floating back into the pool.
If the weir becomes stuck, damaged, or improperly positioned, it can restrict water entering the skimmer.
Combined with a low water level, that may cause the skimmer to begin pulling air.
🔹 7. Persistent Air Can Lead to Bigger Problems
Air bubbles themselves are usually a symptom.
The bigger concern is what is causing them.
If a pump continually pulls air, it may not circulate water efficiently.
Poor circulation can affect:
- Filtration
- Chlorine distribution
- Water chemistry
- Algae prevention
- Overall water quality
And if a pump repeatedly runs without enough water, it can eventually damage the equipment.
⚠️ A Few Bubbles or a Constant Stream?
A few bubbles when the system first starts may be completely normal.
Air can temporarily enter the system after:
- Cleaning the pump basket
- Cleaning the filter
- Opening plumbing connections
- Performing equipment repairs
Once the pump is fully primed, however, those bubbles should normally disappear.
A continuous stream of bubbles deserves further investigation.
💡 Don’t Just Watch the Bubbles — Find Out Where the Air Is Coming From
The solution may be as simple as adding water or cleaning a basket.
But it could also be a failing pump lid seal, leaking valve, damaged fitting, or suction-side plumbing problem.
Catching the issue early can help prevent poor circulation and potentially more expensive equipment repairs later.
📞 Seeing constant air bubbles from your pool returns?
Don’t wait for a small circulation problem to become a bigger repair.
Contact ACORB Pools and let us take a closer look at your system. Call us at 832 818 8584
We don’t just look at whether your pool appears clean. We pay attention to the equipment, circulation, and water chemistry that keep the entire pool working properly.
🌐 www.acorbpools.com
📧 info@acorbpools.com
ACORB POOLS
“We Don’t Just Skim and Go.”
