Dirty water pumped back in the pull at the start of the pump.

Hi!
New pool owner and new to this forum. Looking for some advice. I have a unground pool with sand filter and Hayward valve. When I turn my pool pump on a lot of air comes out in the return line and after few seconds it goes away and then I get dirty water in the pool for a second. Why is that?
 
What clogged it? Is it reclogged? "The first thing to fix is the last thing that broke"

What is the psi on your filter? Did it read lower when you backwashed it?

Not much lower after back wash
What clogged it was equaliptus leaves.

- - - Updated - - -

Not much lower after back wash
What clogged it was equaliptus leaves.
Psi is just under 20
 
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