TDS off?

[capt85]

I bought a RODI unit from a fellow reefer a while ago and never took the chance to look at the TDS meter.

Now come 4 months later I thought to take a look and something looks weird.

My TDS IN is 007 but my TDS OUT is 047.

Is there a chance the wires on the reader are crossed?

I don't think it is plausible that my filter is contamintaing my water and 007 sounds way too low for normal tap water.

Any Input??

[ragingreefer]

Does it say x10 on the inlet water, or do you have the probes backwards. If not maybe try to check it with another meter.