Hi, I have a problem that I hope you can help me with. Last year toward the end of the season my second skimmer that is furthest from the pump stopped getting suction. It has always had strong suction up to this point. I figured that somehow the line clogged up. So when I closed the pool I blew the pipes out with compressed air and water was blowing up through the skimmer but I didn't see any debris come out. I figured it must not be clogged because air and water were going through it. But when I opened my pool this season I still am not getting any suction.
My setup is old it just has 2 skimmers that the lines Y off before the pump and it has 2 returns. No main drain.