Have RO water, do i need to add Deionization?

Mark9 · 09/11/2013, 10:54 AM

My wife did not like the water in our house so I put in a RO unit a while back.
Now, i'm soon going to be setting up a marine tank.
Can I just use the RO water or do I need the Deionization?
I see drsfostersmith sells them.
http://www.drsfostersmith.com/produc...m?pcatid=26095
Is it a must?

thegrun · 09/11/2013, 11:41 AM

Almost always.

Hzuiel · 09/11/2013, 12:17 PM

Yes, I think just out of the RO membrane most filters put out 20-40ppm. The de-ionization catridge generally removes the rest leaving 1 or less ppm. adding a DI stage is usually quite cheap. Even a dual stage maxcap di from spectrapure is less than 100 i think.

joshyross70 · 09/11/2013, 02:08 PM

do u have to do this even if ur buying the water from somewhere?

thegrun · 09/11/2013, 02:15 PM

Quote:

Originally Posted by joshyross70

do u have to do this even if ur buying the water from somewhere?

If you purchase RO/DI water then no, it should already be filtered. It is a good idea to have a TDS meter however to be sure your purchased water is properly filtered.

JDMR2 · 09/11/2013, 07:27 PM

My tds meter reads 0 after my RO. However, I still got the DI filter due to the initial high tds creep when first starting it. But I used RO only before without issues, so long as your tds is 0.

09/11/2013, 10:54 AM	#1
Mark9 Registered Member Join Date: Aug 2013 Location: Atlanta Posts: 2,497	Have RO water, do i need to add Deionization? My wife did not like the water in our house so I put in a RO unit a while back. Now, i'm soon going to be setting up a marine tank. Can I just use the RO water or do I need the Deionization? I see drsfostersmith sells them. http://www.drsfostersmith.com/produc...m?pcatid=26095 Is it a must?

09/11/2013, 11:41 AM	#2
thegrun Registered Member Join Date: Dec 2008 Location: Garden Grove, Ca Posts: 17,023	Almost always.

09/11/2013, 12:17 PM	#3
Hzuiel Registered Member Join Date: Oct 2012 Location: Louisville KY Posts: 344	Yes, I think just out of the RO membrane most filters put out 20-40ppm. The de-ionization catridge generally removes the rest leaving 1 or less ppm. adding a DI stage is usually quite cheap. Even a dual stage maxcap di from spectrapure is less than 100 i think.

09/11/2013, 02:08 PM	#4
joshyross70 Registered Member Join Date: Aug 2013 Posts: 394	do u have to do this even if ur buying the water from somewhere?

09/11/2013, 07:27 PM	#6
JDMR2 Registered Member Join Date: Feb 2010 Posts: 51	My tds meter reads 0 after my RO. However, I still got the DI filter due to the initial high tds creep when first starting it. But I used RO only before without issues, so long as your tds is 0.