I have an IG pool with attached spa and If you look at the picture the PVC with the white handles on it the inner one says main (I assume that is the main Pool Drain) the outer some says skimmer. Does that control both Skimmers? At the point that the 3 PCV come together on the right side, it says suction no. idea what the left side says. The other Value I assume goes to the heater but that is not working. We knew that when we bought the house. Could someone be so kind as to tell me for normal pool function what should to open and what value the values should be pointed? Thank you in advance for your time.