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# Air bubbles in pump or return jets

# **Air Bubbles in Pump or Return Jets**
### *Why You See Air in the Pump Basket or Coming From the Return Jets*
Seeing bubbles inside the pump lid or in the pool’s return jets is one of the most common pool system symptoms. In most cases, it means **air is entering the system somewhere on the suction side** (from the skimmer to the pump). Small bubbles are usually minor, but constant or heavy bubbles signal a problem that should be corrected.
This guide explains the causes and what you can check before requesting service.

# ⭐ **1. Water Level Too Low (Most Common)**
When the water level drops below the midpoint of the skimmer opening, the skimmer begins pulling **air + water** instead of **water only**.
### **Signs:**
* Bubbles blowing out of return jets
* Skimmer making a “slurping” noise
* Pump basket not staying completely full
### **Fix:**
* Raise the water level until it reaches **halfway up the skimmer opening**
* Make sure the skimmer weir door swings freely
This alone fixes more than 50% of bubble issues.

# ⭐ **2. Skimmer or Pump Baskets Clogged**
Debris restricts water flow and causes the pump to pull air.
### **Check:**
✔ Skimmer basket packed with leaves
✔ Pump basket has debris or hairline cracks
✔ Skimmer socks overly dirty
### **Fix:**
* Remove and clean all baskets
* Inspect for cracks—replace if damaged

# ⭐ **3. Pump Lid O-Ring Issue**
The pump needs an airtight seal. A bad O-ring allows air to enter.
### **Possible problems:**
✔ O-ring is dry, flattened, or cracked
✔ O-ring not seated correctly
✔ Pump lid not tightened fully
✔ Dirt or debris around the lid
### **Fix:**
1. Turn pump off
2. Remove pump lid
3. Clean the O-ring and lid groove
4. Apply **pool-safe silicone lubricant**
5. Reseat and tighten the lid firmly
If bubbles disappear afterward, the O-ring was the issue.

# ⭐ **4. Suction-Side Air Leak (Underground or Above Ground)**
Any suction leak before the pump will draw air into the system. These typically require professional inspection.
### **Possible leak points:**
* PVC unions
* Cracked pipe at pump inlet
* Fittings at skimmer
* Suction valve O-rings
* Underground suction lines
### **Signs:**
* Large bubbles from return jets
* Pump struggles to stay primed
* Air returning after being bled out
* Loud whistling or hissing near pump
### **Fix:**
* Check unions for tightness
* Inspect for visible cracks
* If air continues, contact us for diagnostics

# ⭐ **5. Air Leak From Vacuum or Suction Cleaner Hose**
Vacuum hoses often develop tiny leaks.
### **Check for:**
✔ Loose hose sections
✔ Old hoses with pinholes
✔ Missing O-rings where hoses connect
### **Fix:**
* Reconnect hose sections securely
* Replace aged or cracked hoses
* Make sure the hose stays fully submerged

# ⭐ **6. Dirty or Clogged Filter**
When pressure rises due to a dirty filter, water flow drops, and bubbles may appear.
### **Fix:**
* Clean cartridge
* Backwash (if using sand or DE)
* Ensure pressure returns to normal

# ⭐ **7. Newly Plastered Pool (Normal)**
If your pool was recently resurfaced:
✔ Micro-bubbles are **normal for the first few days**
✔ The curing and startup process releases air
These disappear on their own.

# ⭐ **8. When Bubbles Are a Serious Issue**
Contact Professional Pool Company if you notice:
✔ Pump losing prime
✔ Bubbles getting worse over time
✔ Loud noises from pump housing
✔ Water leaking around pump inlet
✔ Return jets spitting bursts of air
This may indicate:
* A significant suction leak
* Bad pump shaft seal
* Undersized plumbing
* Cavitation
* Cracked fitting underground
We can identify and repair the root cause.

# ⭐ **Summary**
Air bubbles in your pump or return jets usually mean:
* Water level too low
* Baskets clogged
* Pump lid O-ring not sealed
* Vacuum hose leak
* Suction-side plumbing leak
Small bubbles = often harmless
Large or constant bubbles = system problem that needs correction

# ⭐ **Need Help?**
If bubbles persist after basic checks, contact Professional Pool Company. We can troubleshoot suction leaks, pump issues, or plumbing problems to restore proper flow.