Ive benn running it this morning again trying to make SOME water for a WC today. TDS coming out is now down to 4. I'll be using this on my fresh water tank. Wont bother making SW with this one. I was running one of these for the longest and always had good results with them and would have stuck with it if the replaement cartridges weren't so $25 a clip.
http://www.marinedepot.com/Aquarium...icals_API_MARS_Fishcare-AP4111-FIRODI-vi.html
http://www.marinedepot.com/Aquarium...icals_API_MARS_Fishcare-AP4111-FIRODI-vi.html