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Discussion Starter · #1 ·
I purchased some RO water from my LFS.
I tested the water with my TDS meter and received a reading of 9ppm.

Shouldn't the TDS reading of RO water be 0?
I don't think this is a meter calibration issue, as I have a Zer000 water pitcher that produces 0ppm TDS water. Using the same meter.
 

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tim is correct, my RO unit has an inlet TDS of 300+ and on the outlet side its 004 TDS. If you buy it again, do the same thing if the TDS is higher tell your LFS to change the cartridges.
 
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