I have a BRS 4 stage value plus water saver 150GPS RODI system. Everything has been working perfectly for months and then all of a sudden my TDS started creeping up to 2-4 on the output. Then I noticed that the input is reading about the same as the output. Literally nothing has changed that I'm aware of. Resin didn't look spent but I changed it anyway (per BRS directions on youtube). No channeling that I can see. Also changed out sediment and carbon filters just to say I addressed everything that could be the issue. Changed the TDS meter thinking maybe that was damaged somehow. Made sure probes were positioned properly when installing new meter. Pressure is well above 60. Put on a pump to see if that would do anything and it did not. I'm at a loss here. Any thoughts/advice on what else I can try before I scrap this whole thing and get a new one? It's less than a year old.