Hi all, have a little issue looking for some input on. Just opened pool and got it running. Noticed I had next to no water flow out of returns and high pressure. Took my DE filter apart and cleaned grids. That did the trick however now I notice in the skimmer closest to my pump it is actually pulling so much water that it takes air in. Whirl pool effect in that skimmer, its like the water leaves faster than it comes in. I also notice I have one of my pavers collapsed behind skimmer. Thoughts? I could close the damper down in the bottom of the skimmer to limit the suction I guess but what is the real cause? Could I have skimmer door issue? What else can I use to troubleshoot? Thanks in advance for all your suggestions!