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Old 04/27/2017, 02:29 PM   #4329
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Join Date: Mar 2002
Location: Mountain View, CA, USA
Posts: 86,558
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:

That article has more on what happens then.

Jonathan Bertoni
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