Cloud blows back into pool after Backwash and Rinse

Captain 776

Bronze Supporter
May 2, 2016
This has been going on for a while now.
After Backwash and Rinse, when I put Multiport back on Filter and put pool back in normal service, it sends a cloud of dust and debris back into the pool through the returns.
I let it Backwash until the sight glass is crystal clear, I shut off the pump and back on a few times so it mixes up the glass media well.
I do the same thing in the Rinse cycle.

Have any of you experienced this?
Could a damaged Spider Gasket cause this?