Great question — it touches on a key aspect of spa plumbing design, especially the relationship between water and air systems.
Short Answer:
Yes, the pool (or spa) water pipe can run right next to the air pipe ring, but with careful planning and understanding of how the system behaves — especially when the blower is off and parts of the air line are below water level.
However, there are important design considerations to avoid waterlogging, poor jet performance, and potential backflow issues.
