Yes you can, but I dont recommend it, its not the same. Try this place for R/O units. purewaterclub*com _________ 11 yr old system, 90g Corner-megaflow DT, custom 55g sump/refug, 692w lighting, Mag-18, AquaC EV 180, AC-Jr, Pin-Point Cal monitor and too many corals and fish to list. Happy Reefing  | 
