Difference in TDS Readings

Powersds

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On my RODI system the outgoing in line TDS always measured 0, but it currently is 3 but a handheld TDS UNIT measures 0. Why would this be. I thought I needed to change the filters so I did (it was getting close to a change anyway) but the TDS readings stayed the same.
 

vetteguy53081

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On my RODI system the outgoing in line TDS always measured 0, but it currently is 3 but a handheld TDS UNIT measures 0. Why would this be. I thought I needed to change the filters so I did (it was getting close to a change anyway) but the TDS readings stayed the same.
Try flushing the unit and retest
 
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