OK, would love your opinion on everything that I’ve got going on and keep in mind I just moved in about a year ago. So here is what I have going. I have so many check valves because my pump and filter is probably 6 feet above my pool as my yard is on a slope. so they installed those check valves. I have a spa main drain - which is TOTALLY not functional. I’m thinking that the pipe is actually cracked because anytime I try to open that valve. It sucks up air and then it just starts bringing in leaves and junk. I haven’t really looked into it because I might have to tear up the concrete and fix the actual pipe. I have not done a pressure test on it yet. The returns work in the spa perfectly fine.
Then I do have a main drain in the deep end, as well as to skimmers and two returns (one under each skimmer).
Currently I’m dealing with what seems to be a cracked main drain in the spa, and air bubbles in my returns (have to clear pool first before dealing with those issues)
But yes my question was just the positioning of that valve if I was supposed to be able to have both skimmer 100% open. Or if one is always 25% closed by default.