Should I get a 4 or 5 stage RO/DI? - Page 2

Randy Holmes-Farley · 12/07/2009, 10:08 AM

In a 5-stage RO/DI, I'd rather have 2 DI stages than two carbon stages. That allows more complete use of the DI resins before discarding them.

Buckeye Hydro · 12/07/2009, 10:35 AM

I looked through your 2009 report. No sign of chloramines being added.

So one carbon stage ought to be fine.

Russ

Xgame2k · 12/07/2009, 10:42 AM

My water company uses ozonation and chlorination so I would only need a 4 stage correct?

vipjd39 · 12/07/2009, 10:57 AM

Randy, so would you put DI at stage 3 and again at stage 5?

cpittmx · 12/07/2009, 11:02 AM

I looked up water quality for my home town and only see chlorine and chlorine dioxide listed as residual from disinfectant so I'm assuming they do not use chloramine. Is this a safe assumption?

asl4me76 · 12/07/2009, 11:11 AM

Confirm before you purchase in your area if whether or not you have Chloramine in your water source. If you do, get one that filters that junk out as well

But 5 stage is the way to go

Randy Holmes-Farley · 12/07/2009, 11:36 AM

Randy, so would you put DI at stage 3 and again at stage 5?

4 and 5, like this one:

http://www.spectrapure.com/St_MaxCap-RO-DI.htm

FranktheTankTx · 12/07/2009, 12:41 PM

Like Russ said - having a 5 stage RO/DI unit is not necessary or in this case, 2 carbon stages unless you have chloramines. If you're going to get a 5 stage just to get a 5 stage, I would run dual DI rather than 2 carbon stages.

I ran a 4 stage unit with my last tank for 12 months & produced 0 TDS everytime.

sam11909 · 12/07/2009, 06:41 PM

I'll be moving to college soon and I don't know where I'll be going so just to be safe I'll get two carbon stages and add an extra DI if I need it later.

Thanks for the comments!

lordofthereef · 12/07/2009, 07:00 PM

Quote:

Originally Posted by lordofthereef

Depends on how much water you use IMO. You will get more efficiency out of your DI resin in a 5 stage unit, but if you are not making lots of water and are reaching the time to replace all filters (yearly mark) then you have no need for a 5 stage IMO.

I miss spoke here and would like to correct it. I was comparing a 5 stage to a 6 stage in my head, not a 4 to a 5. It is going into 6 stage that my previous statement makes any sense. My apologies.

12/07/2009, 10:08 AM	#26
Randy Holmes-Farley Reef Chemist Join Date: Apr 2001 Location: Arlington, Massachusetts Posts: 86,233	In a 5-stage RO/DI, I'd rather have 2 DI stages than two carbon stages. That allows more complete use of the DI resins before discarding them. __________________ Randy Holmes-Farley Current Tank Info: 120 mixed reef

12/07/2009, 11:36 AM	#32
Randy Holmes-Farley Reef Chemist Join Date: Apr 2001 Location: Arlington, Massachusetts Posts: 86,233	Randy, so would you put DI at stage 3 and again at stage 5? 4 and 5, like this one: http://www.spectrapure.com/St_MaxCap-RO-DI.htm __________________ Randy Holmes-Farley Current Tank Info: 120 mixed reef

12/07/2009, 12:41 PM	#33
FranktheTankTx Registered Member Join Date: Dec 2007 Location: Texas Posts: 2,306	Like Russ said - having a 5 stage RO/DI unit is not necessary or in this case, 2 carbon stages unless you have chloramines. If you're going to get a 5 stage just to get a 5 stage, I would run dual DI rather than 2 carbon stages. I ran a 4 stage unit with my last tank for 12 months & produced 0 TDS everytime. __________________ Frank the Tank "What, I thought we were in the trust tree... in the nest? Are we not?" Current Tank Info: Custom Rimless 60g (30.5"x24.5"x18.5")

12/07/2009, 06:41 PM	#34
sam11909 Maxi Mini Join Date: Jun 2009 Location: Tallahassee, FL Posts: 1,039	I'll be moving to college soon and I don't know where I'll be going so just to be safe I'll get two carbon stages and add an extra DI if I need it later. Thanks for the comments! __________________ Samuel A reef aquarium is simply an aquarist's best try of painting a small section of the ocean and containing it in a glass frame. Each new coral adds a new color or brush stroke to the painter's toolbox. Current Tank Info: The Stair-Stepping Nano System

12/07/2009, 10:35 AM	#27
Buckeye Hydro .Registered Member Join Date: Sep 2006 Location: Cincinnati, Ohio Posts: 4,857	I looked through your 2009 report. No sign of chloramines being added. So one carbon stage ought to be fine. Russ

12/07/2009, 10:42 AM	#28
Xgame2k Registered Member Join Date: Aug 2009 Location: Gilbert, Arizona Posts: 786	My water company uses ozonation and chlorination so I would only need a 4 stage correct?

12/07/2009, 10:57 AM	#29
vipjd39 Registered Member Join Date: Apr 2006 Location: Charlotte, NC Posts: 409	Randy, so would you put DI at stage 3 and again at stage 5?

12/07/2009, 11:02 AM	#30
cpittmx Registered Member Join Date: Sep 2009 Location: Ravenna, Ohio Posts: 260	I looked up water quality for my home town and only see chlorine and chlorine dioxide listed as residual from disinfectant so I'm assuming they do not use chloramine. Is this a safe assumption?

12/07/2009, 11:11 AM	#31
asl4me76 Registered Member Join Date: Nov 2008 Location: Southeast Oklahoma Posts: 575	Confirm before you purchase in your area if whether or not you have Chloramine in your water source. If you do, get one that filters that junk out as well But 5 stage is the way to go