This is good intel Slief, thanks. I wasn't aware that aquaultraviolet made these combo units. I trust your experience and will ditch the ultralife brand. I couldn't reach them directly and couldn't find any real documentation on them anyways. From what I am reading, aqua ultraviolet offers several combo units in various sizes. That's a plus.
Their 57 watt combo is rated for 355 gallons Saltwater. My setup is 160 gallons total water volume with the Refugium. That should be beefy enough I would think. Do you agree?
http://www.aquaultraviolet.com/produ...ozoneuv/57watt
And
http://www.aquauvstore.com/Ozone-Com...es-sc-206.html
I was thinking that I would tap off the main pump and route about 100gph (or some other low amount) and just return the treated water back to the sump. I make better use of the main pump, avoid needing another pump too. I may get a couple of valves to control the flow exactly the way I want it.