37 Psi!!!!!

[Poconos]

Hal,
Poolsean will probably kick in here but I would imagine that would have to be one heck of a scale buildup to cause a pressure rise like you are experiencing. I don't know what the guts of those cells look like. The pressure rise would have to be due to something after the input to the filter. Sorry I don't have any bright ideas at this time.
Al

[Sumo1]

Thanks. Just picked up a new gauge. Will install and report back.
Hal