Looks like standard 5-stage RO filter with a sixth stage that appears to re-introduce some ions. RO water will have ions anyway, but they appear to be marketing a reintroduction of them.
In my next place I'm using my water pump to increase the pressure from the RO so that it will run my Blumats. RO water after 5 stages is similar to rain water, as far as I can tell. I've already added trace minerals to my soil.