Pentair Kreepy Krauly Slows or Stops — Air Bubbles at Return Line
When the Kreepy Krauly slows down or stops intermittently and air bubbles are visible coming out of the return jets, the pump is losing prime. Air is entering the suction side of the system faster than the pump can expel it, which reduces the flow available to the cleaner. The Pentair manual identifies this symptom specifically and lists three places to inspect: the cleaner hose, the vacuum connection, and the pump basket lid. The fix is finding and correcting the air leak — the cleaner itself is functioning normally.
Understanding the Symptom
The cleaner depends on a steady column of water flowing through its suction line. When air enters the suction side, the pump's impeller begins moving air instead of water. Effective flow to the cleaner drops, the cleaner slows or stops, and air that passes through the system exits as bubbles at the return fittings. You may also notice:
- The cleaner becomes sluggish periodically before resuming, then slowing again
- Gurgling or rattling from the pump
- Visible air bubbles churning through the pump strainer pot lid (if clear)
- Lower-than-normal filter pressure gauge reading
Check 1: Inspect the Cleaner Hose for Cracks or Loose Connections
The hose sections and their connection points are the most likely source of air intrusion when the cleaner is in use. Any crack, pinhole, or loose fitting on the hose will draw air while submerged.
- Turn off the pump
- Remove the cleaner and hose from the pool
- Hold each hose section up to a light source and flex it gently — look for cracks, pinholes, or deterioration in the hose material
- Check every coupling connection between hose sections — connections should seat firmly with no play; a loose or cracked coupling allows air to enter at that joint
- Inspect the swivel connection at the cleaner end — the swivel should turn freely but seal against the hose without gaps
- Replace any cracked hose section or damaged coupling
Check 2: Verify the Vacuum Connection Is Submerged
The point where the cleaner hose connects to the pool's suction inlet — whether through the skimmer or a dedicated vacuum fitting — must be below the waterline at all times while the pump is running. If this connection point is at or above the water surface, the pump draws air directly rather than water.
- Check the pool water level — the manual states water must be high enough that the vacuum connection (the skimmer or dedicated suction port) remains fully submerged during operation
- If the water level is low (below the midpoint of the skimmer face), add water to raise the level before running the cleaner
- If using the skimmer port, verify the cleaner hose connects securely into the skimmer inlet at the bottom of the skimmer basket chamber — a loose or improperly seated connection pulls air from above the waterline
- If using a dedicated in-wall vacuum port, verify the hose adapter seats fully and the port is below the waterline
Check 3: Inspect the Pump Basket Lid
The pump strainer basket lid is a common source of suction-side air ingestion. The lid relies on an O-ring to create a watertight seal. If the lid is loose, cracked, or the O-ring is worn or missing, air enters the pump housing continuously.
- Turn off the pump and allow the strainer pot to cool to the touch
- Turn the clamp counter-clockwise and remove the lid
- Inspect the lid for cracks — even hairline cracks will allow air ingestion under suction; replace the lid if cracked
- Remove the O-ring from its groove and inspect it — look for cuts, flattening, deformation, or signs of chemical degradation; replace if worn
- Clean the O-ring groove and the sealing surface on the strainer pot body
- Apply a thin film of silicone lubricant to the O-ring before reinstalling — do not use petroleum-based lubricants
- Reinstall the lid and tighten the clamp until the handles are horizontal
- Restart the pump and check whether bubbles at the returns have stopped
Kreepy Krauly Troubleshooting Reference (from Manual)
| Problem | Possible Cause | Corrective Action |
|---|---|---|
| Slows / stops with air bubbles at return line | Air leak in hose | Inspect hose for cracks and connections for looseness; replace damaged hose sections or couplings |
| Slows / stops with air bubbles at return line | Vacuum connection above waterline | Verify vacuum connection is submerged; raise water level if needed |
| Slows / stops with air bubbles at return line | Pump basket lid loose, cracked, or missing O-ring | Check lid for cracks; inspect and replace O-ring if worn; lubricate O-ring and retighten lid |