I would not hold pressure in the filter, as then you would be leaving moisture that has migrated to the bottom of the filter, in the system. The whole point of the filter is to both filter and seperate moisture. Leaving it in, would overload the moisture absorbing beads a lot quicker. I'm assuming that according to GX advertising, the beads could convievably last a year, leaving moisture in the system would certaily shorten that lifespan immeasurably.
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