Hello, first time opening pool on my own. I have 2 skimmers and each has two holes in bottom with each having the hole closest to the pool blocked. From reading it sounds like maybe they are supposed to be but wanted to confirm it wasn't something the pool company does when they closed it and one should be removed. The other holes had the gizmos. If thats all good then how should i turn the valves on in the picture? I cant find the pictures i took last year. Thanks