u/Impossible_Mud3534

Hello, this week when we had our pool guy open the pool (we have a DE filter) he said the pool wasn’t priming. He replaced impeller, defuser, impeller screw and orings. He also took apart the filter, cleaned and all orings  lubbed . Filter was recharged to manufacturer specs. He said it was running and gave me the attached pics. But when I just looked the pressure was very high like at 40 and it wasn’t hardly pushing or pulling any water. Google said there is a blockage somewhere. How do I even start to find it?