Should I be able to turn my main drain off when vacuuming through a skimmer plate? My pump seems to lose prime when I do. I have two skimmers and vacuum through a plate into the skimmer basket and put another plate on my other skimmer and close it off. Usually the plate I am not vacuuming through will move out of place and not stay seated. I was just wondering what the typical procedure might be.
By the way, I am filling the hose with water before I begin this process. Thanks.