I don't recall where the flow restrictor is located on the coralife units. I used one of these units in the past, but I don't think I ever looked for it. The units themselves are ok, but the stock filters, membrane, and resin are sub-par, IMHO.
you say the filters are sub par, are there better filters and membrane that I can use in this unit seeing how I already have the system? Thanks for all the help Amphiprion and Fsn77.