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Changing a R/O Membrane

Hi Group,
It's been quiet here so I figured I ask you a technical question: I've been operating my R/O unit for almost 3 years without changing the original membrane. The flow of produce water really slowed down lately. I got a new membrane last week.
I pulled the old membrane out of the housing and pushed the new one back in. I reconnected all the hoses but don't get any pressure or produce water. So far I've operated the unit no longer than a 1/2 hr . I don't want to let it run for a longer time when I'm not there to watch it. Should I let it run longer? Do I need to vent the housing somehow?
Did I do anything wrong? Just wonder. Any tips are greatly appreciated.

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