That is the missing piece of the puzzle for me. I don't think this Jandy check valve was visible in your original set of pictures of the non-Caretaker spa return.Dodger,
Thank you for the visual. I've been looking at the photos of my system and believe I have identified the Caretaker and spa backflow preventers. I've attached a photo of my plumbing set up at pump/filter/heater location. I believe this is the backflow preventer for the spa, and if so then then the backflow preventer located near the Caretaker must be solely for the Caretaker system, correct?View attachment 72146
James,That still seems a little high but your pump is greatly oversized. I would consider going to a smaller impeller or pump or variable speed pump.