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Thanks, I will check that out. Steve

No visible exterior leaks. Pressure reads at 18 psi which appears to be normal for a clean set of cartidges. No valves on return side since there is no spa or return line control.

I have a Pentair Clean & Clear Plus 320 filter which worked fine until we had a freeze (13 degrees) last winter. I suspected the cartridges may have been damaged so I replaced them but it still appears that something is wrong. I kust returned from a trip and found the pool water itself to be...