So, I'm a new pool owner and am having trouble figuring out how to circulate water only in the spa portion of my pool. I have shut off the return valve to the main part of the pool and left open the spa return. Then, shut off the skimmers and main drain and opened the spa drain. The water level starts to go down at that point. I have realized that water is still leaving the spa because the return that my Polaris cleaner is hooked up to splits off before the point on the plumbing that splits the main returns and the spa returns. Make sense????? There is no valve on the Polaris tube that goes to the Polaris booster that makes the robot work. (At least no valve that looks like the rest of my valves.) Any ideas????