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Old 04/27/2017, 03:29 PM   #4329
bertoni
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Join Date: Mar 2002
Location: Mountain View, CA, USA
Posts: 85,841
Water should come out of a RO/DI setup at 0 ppm TDS. Once carbon dioxide and other compounds start entering it, the TDS will rise. That's not important as long as the containers are food-grade and not contaminated.

A TDS above zero out of a RO/DI unit means that the DI is shot:

http://reefkeeping.com/issues/2005-05/rhf/index.htm

That article has more on what happens then.


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