I have had this problem EVERY year right after opening. With my pool -- I never close it like I should, so when I open it back up -- it usally takes a LONG time to get it in shape.

So I start beaching -- and running the pump. After about 20-30 minutes there is almost NO circulation or suction going on -- so I go out - backwash/rinse then wait another 20-30 minutes. Eventually I get to every few hours, then the problem cures itself. I go through this for about 2 days, then once the water starts clearning up, it normal circulation / flow return for good.

I cant tell you how many times I have asked this same question here, and no one really understood what I meant. Everyone suggested that I might have a problem with my pump, impeller, skimmer, return lines -- nope all were checked and fine. It just happens to me every single year. Just one of those things, for me anyway.