Did you change the plumbing?

Maybe the laterals got clogged when the multiport was plumbed backwards.

Does backwashing work now?

 
I would also recommend posting a full set of water test results.

Please update your signature. There is nothing showing at the moment to describe your pool or equipment info. See my signature as an example.

Also see ---------> Create Your Signature - Further Reading
 
Did you change the plumbing?

Maybe the laterals got clogged when the multiport was plumbed backwards.

Does backwashing work now?

I did! And yes!
 
What happens when you change the filter valve to recirculate? Does the pressure or flow rate change?
 

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