I have a Jandy CL 460 filter and just cleaned the cartridges. Normally the initial PSI is around 10 after a cleaning, this time however it was about 20.
I have replaced in the last week the manifold and filter breather tube assembly on the inside of the filter so it definitely is not a clogged breather tube issue. The cartridges themselves are only about a year old and seem relatively clean. While the pump is running on high I will attempt to bleed off any excess air in the filter but there usually is not any present and just a steady stream of water spurts out of the pressure relief valve on the guage up top.
After all of that, does it mean it must be the filter cartridges? I have not attempted to run the filter without the cartridges inside. Would that be safe to try and see if the pressure is the same without cartridges? A suction side air leak?
All ideas are appreciated as I'm pretty frustrated at this point.