Shuffling of RO membrane.

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We have a two-stage RO system in our ETP, with each stage containing one vessel, and each vessel housing 8 membranes. The recovery of the RO plant has decreased, and there has been no improvement despite several CIP cycles. I am considering shuffling the membranes. Is there a thumb rule or pattern for membrane rearrangement? Which membrane should be moved to which location within the vessel? Could you shed some light on this?