Sorry...posted on wrong forum earlier. All 3 of my diverter valves are starting to stick when moved and may be introducing air into the suction side of the pump. I will be rebuilding all 3 within about a week. I usually run the pool in the position shown with the spa supply and return off. When using the spa I only run the spa supply and return with everything else off. My quick question is can I run with all supplies and returns open? I would guess that this would result in the filter showing a lower pressure than when I am running in the normal "pool" only positon and I would be moving a larger volume of water????