I have checked everything I possibly know to determine why the pressure on the jets has gone down. I am 99% sure its nothing to do with the filter because the pressure stays low even when bypassing the filter. Its a brand new pump working fine - no blockage there or in skimmer. The only thing I have not done is open up the "flow handle mechanisms (see photos attached) to see if there's a blockage in there. I'm reluctant to do that because I can just imagine some spring bouncing out of there or something - Is it ok to unscrew the tops of these units and look inside for bloackage?
Thanks in Advance