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bertoni · 04/27/2017, 02:29 PM

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.

04/27/2017, 02:29 PM	#4329
bertoni RC Mod Join Date: Mar 2002 Location: Mountain View, CA, USA Posts: 88,616	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. __________________ Jonathan Bertoni