Problems with ro/di

Golfman12 · 10/25/2014, 06:18 PM

I have a aqua fx great white ro/di unit that has 2 NH2Cl stages and 2 di stages. I live in AZ and our tap TDS is over 700. I just changed my carbon and Di filters about a month ago. I tested the tds of my ro/di water and it's at 199. Does that mean I need to change my Ro membrane or could the be some other problem?

acabgd · 10/25/2014, 06:30 PM

How long did you use the membrane?

Aquarist007 · 10/25/2014, 06:36 PM

Resins are only good for 200 gals

Golfman12 · 10/25/2014, 07:21 PM

Quote:

Originally Posted by acabgd

How long did you use the membrane?

Ro membrane is about a year old

Golfman12 · 10/25/2014, 07:22 PM

Quote:

Originally Posted by Aquarist007

Resins are only good for 200 gals

I hope they are good for more than 200 gallons.. It's a 300 gpd unit

Aquarist007 · 10/25/2014, 10:26 PM

Quote:

Originally Posted by Golfman12

I hope they are good for more than 200 gallons.. It's a 300 gpd unit

Have you ever gotten close to 300 gph out of it?

acabgd · 10/26/2014, 11:50 AM

Quote:

Originally Posted by Golfman12

Ro membrane is about a year old

With such high TDS it might well be toast. You would really need to measure your RO output (before the DI resin) in order to know. I suspect you might measure too high, that's why your resin gets depleted so quickly.

Tom Fay · 10/26/2014, 12:44 PM

So your RODI unit has 3 membranes. I think either one or more of them are damaged or water is leaking past them (like they need reseated). Check your TDS before and after the membranes. If you have 700 going in you should have somewhere in the neighborhood of 35 coming out (assuming a 95% rejection ratio). Have you ever changed the carbon blocks in a year? When those get exhausted the membranes can get damaged from chlorine or chloramine (whichever your local water department uses to sterilize your water).

azjohnny · 10/26/2014, 01:03 PM

Get a Spectrapure 99% rejection membrane, it brings my after membrane readings to 8ppm from 700ppm

Spectrapure makes their products for the hard and high TDS water we have in AZ

hkgar · 10/26/2014, 02:17 PM

+1 for the Spectrapure. My out form RO TDS is 0-1. Comparitively though my well water after softener is 370.

DI resin does not have a life based on gallons processed. The life is based on the TDS processed. With an out TDS from the RO of 0-1 my DI will last a looooooooong time.

azjohnny · 10/26/2014, 02:20 PM

Quote:

DI resin does not have a life based on gallons processed. The life is based on the TDS processed. With an out TDS from the RO of 0-1 my DI will last a looooooooong time.

+1

DI life also depends on the quality of the DI and if any CO2 is present in the water

SpectraPure · 10/28/2014, 01:01 PM

Golfman 12,

We are in Arizona, and we can help you out. Email me your information, and I can call you tomorrow.

Jeremy
Support@spectrapure.com

10/25/2014, 06:18 PM	#1
Golfman12 Registered Member Join Date: Jul 2014 Location: Avondale Posts: 44	Problems with ro/di I have a aqua fx great white ro/di unit that has 2 NH2Cl stages and 2 di stages. I live in AZ and our tap TDS is over 700. I just changed my carbon and Di filters about a month ago. I tested the tds of my ro/di water and it's at 199. Does that mean I need to change my Ro membrane or could the be some other problem?

10/25/2014, 06:36 PM	#3
Aquarist007 Registered Member Join Date: Apr 2007 Location: Hamilton, Canada Posts: 28,240 Blog Entries: 1	Resins are only good for 200 gals __________________ I prefer my substrates stirred but not shaken Current Tank Info: 150gal long mixed reef, 90gal sump, 60 gal refugium with 200 lbs live rock

10/26/2014, 02:17 PM	#10
hkgar Registered Member Join Date: Oct 2002 Location: Dewitt MI Posts: 5,051	+1 for the Spectrapure. My out form RO TDS is 0-1. Comparitively though my well water after softener is 370. DI resin does not have a life based on gallons processed. The life is based on the TDS processed. With an out TDS from the RO of 0-1 my DI will last a looooooooong time. __________________ Gary 180 gallon, 40 gallon sump, 3 250 W MH + 4 80W ATI T5's, MTC MVX 36 Skimmer, Apex controller Aquamaxx T-3 CaRx Current Tank Info: A 2 Barred Rabbitfish, Red Head Salon, Yellow/Purple, McMaster Fairy, Possum, 2 Leopard Wrasses, Kole, & Atlantic Blue Tangs, 2 Percula Clown, 3 PJ and 1 Banggai Cardinalfish , Swallowtail, Bellus and Coral Beauty Angels

10/28/2014, 01:01 PM	#12
SpectraPure RC Sponsor Join Date: Jun 2003 Posts: 0	Golfman 12, We are in Arizona, and we can help you out. Email me your information, and I can call you tomorrow. Jeremy Support@spectrapure.com __________________ *Innovators in water technology.* Since 1985!

10/25/2014, 06:30 PM	#2
acabgd Registered Member Join Date: Jan 2012 Location: Belgrade Posts: 1,086	How long did you use the membrane?

10/26/2014, 12:44 PM	#8
Tom Fay Registered Member Join Date: Oct 2007 Location: Tampa, FL Posts: 120	So your RODI unit has 3 membranes. I think either one or more of them are damaged or water is leaking past them (like they need reseated). Check your TDS before and after the membranes. If you have 700 going in you should have somewhere in the neighborhood of 35 coming out (assuming a 95% rejection ratio). Have you ever changed the carbon blocks in a year? When those get exhausted the membranes can get damaged from chlorine or chloramine (whichever your local water department uses to sterilize your water).

10/26/2014, 01:03 PM	#9
azjohnny Registered Member Join Date: Apr 2012 Location: Gold Canyon Posts: 2,914	Get a Spectrapure 99% rejection membrane, it brings my after membrane readings to 8ppm from 700ppm Spectrapure makes their products for the hard and high TDS water we have in AZ