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But we can't keep it running longer than an hour.... how are we supposed to complete and shocking cycles?

We are at our wits end! We have a Pentair Nautilus DE filter and can't get it to run for more than at most an hour and a half before the pressure is up to at least 30. We have opened it up and washed down filter grids and re-DE'd it more times than we can count. We finally broke down and...