I can't get to 0TDS, and it irks me. I hold steady at 4 and can't get any lower. My input is between 160 and 200.
neilanh... add a DI stage and you should get to 0. I'm guessing you're running just RO? With a DI stage, there's no reason you shouldn't get to 0. Unless the DI resin is depleted.
To answer the original question... I agree - 0 is 0, so I'd say it's good. Have you double checked the calibration of your TDS meter?
Thanks Kurt, but there is a DI stage on my unit. THe unit isn't even 4 months old yet, and I've never gotten it to 0TDS. It's a 6-stage system that I got off of ebay.
robertfah... you should be able to pick up some calibration solution somewhere if you want to double check your meter. If your LFS doesn't carry it, then try DrFosterSmith, PremiumAquatics, MarineDepot, or any of the other big online folks.