Well I just changed some of the RO/DI filters that I had. The carbon filter was black lol... the replacement one was white.. so I'm guessing that's not a good sign. I also changed the resin stuff. I'm going to let it run for an hour or so then test it with my new TDS meter. I'm waiting to hear back from the guy the system came too as to which replacement filters to order, then I will change everything again. I'm hoping this helps.
Also, has anyone ever had any problems with the nitrates in their storage bins for made up saltwater? I tested for nitrates and they are very high in the trashcan (brute), but low coming out of the RO/DI unit. Was odd.