Aquasafe filter order?

[wetcoast]

The very top looks like the water polisher that I don't typically use in a Reef Setup - they claim it is for better water taste.

The second to top one is actually your RO Membrane. No need to change that one as frequent. Just give it a flushing if you can.

If you are getting limited amounts of water out why not just take out the first 3 bottom filters and see if your output resumes just so you know where the problem resides?

Banged my head many times with RO problems, hopefully this helps.