Do you have a DI unit hooked up as well? You should be getting around 98% reduction in TDS from the RO membrane alone. Given our tap water is around 22 ppm (that's what mine is right now) you should be getting a reading less than 2 or 3 if your RO unit is set up properly. And then the DI should definitely be getting things down to 0.
I had a problem with a home drinking unit that had a "post carbon" canister plumbed in after the RO membrane to add some TDS back in for palatability (taste) for human consumption. I was getting higher TDS readings than I expected. I ended up changing the order of the canisters to have two carbon filters plumbed consecutively before the RO membrane.
What unit are you using exactly? Unless you have a situation like the one I described above (with a "post carbon" canister) then something is amiss with your RO unit.
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