RODI not doing what it's supposed to!

[neoh]

I got a ro/di 4 stage off a member here, with a tds meter. I hooked everything up (completely blind - never done this before) and everything seems to be fine - except the fact that my out tds is showing 350ppm.

So, I figured I had the waste water/good water lines reversed - changed them around, and I still have the same TDS readings.

Every line I change around, my tds readings are still high.

Am I missing something here? It's not rocket science.