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05/28/2014, 11:55 AM
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#1 |
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Relentless Question-Asker
 
Join Date: Feb 2009
Location: Courtenay, British Columbia
Posts: 151
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RO vs. RO/DI
I'm sure this has been asked before, but how important is it to use RO/DI instead of RO only?
For example, my tap water has only 20 ppm TDS. My copper is .003 ppm fluoride is <.01 ppm nitrate is .03 ppm nitrite is <.01 ppm arsenic is <.0002 ppm don't know phosphates, but I'm trying to find out. Thanks!
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Warmly, Cynthia Last edited by frogdog; 05/28/2014 at 12:28 PM. |
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05/28/2014, 12:41 PM
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#2 |
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Registered Member
Join Date: May 2014
Posts: 14
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Wow 20 ppm is pretty low to me. My tap is at 68 and after ro its at 3.
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05/28/2014, 02:45 PM
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#3 |
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Reef Chemist
Join Date: Apr 2001
Location: Arlington, Massachusetts
Posts: 86,233
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That copper is measured where? By your water company? If so, it is not a useful number. Most copper comes from your own pipes, not the water supply.
That said, ammonia from chloramine in the tap water is a reason to use DI, as is silicate, which gets through RO fairly readily.
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Randy Holmes-Farley Current Tank Info: 120 mixed reef |
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05/28/2014, 03:01 PM
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#4 |
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Relentless Question-Asker
Join Date: Feb 2009
Location: Courtenay, British Columbia
Posts: 151
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Thanks for coming to the rescue, Dr. H-F. In other words, I'd have to test the water coming out of my tap, independently, to have a better idea what's in there. Those numbers come from the Public Health Department via the water company's engineering dept. Public Health tests the water. Oh well, it was a good idea, while it lasted.
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Warmly, Cynthia |
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05/28/2014, 03:15 PM
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#5 |
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Reef Chemist
Join Date: Apr 2001
Location: Arlington, Massachusetts
Posts: 86,233
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 Here's a discussion on tap water and RO/DI and what the parts accomplish: Tap Water in Reef Aquaria http://www.advancedaquarist.com/issues/jan2004/chem.htm Reverse Osmosis/Deionization Systems to Purify Tap Water for Reef Aquaria http://reefkeeping.com/issues/2005-05/rhf/index.htm
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Randy Holmes-Farley Current Tank Info: 120 mixed reef |
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05/28/2014, 03:33 PM
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#6 |
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Registered Member
Join Date: Aug 2013
Posts: 54
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My taps at 55ppm in out its at 0ppm...i always have used ro/di since i started keeping corals
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05/28/2014, 03:59 PM
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#7 |
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I got nothin'
Join Date: Nov 2004
Location: The anals
Posts: 6,420
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My tds on my tap is around 780-800.
 Freaking WV water is rediculous. I won't even drink it.
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Quitters never lose. [QUOTE=CStrickland]Who gets mad at a starfish?[/QUOTE] Current Tank Info: 75g DT, 30G refugium, 10g chaeto tank, 50g stock tank basement sump |
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