Opened my pool and it’s only 2 years old. Skimmer for vacuuming is not pulling. I shut down the pool and closed the ball valve for main drain and skimmer. Used a blower to blow line out. Water shot out the other side so looks like it’s clear. I have a blow out cut in after the ball valve. After that I opened the ball valve and blew line from pump through ball valve and did blow out but not as strong. Could my ball valve not be opening all the way or whatever is in the be stuck in there?