DI Resin getting used up fast ???

SFish · 10/09/2014, 08:01 PM

I have had my RO/DI unit for a bit less then a year now. I changed the prefilters on 6/23/14. I use to get 72 to 74 psi going into the RO but now it seem to drop to around 70. My Cl is at 0.58ppm. My rejection rate seems to be around 96 to 97 ish. I'm getting a TDS of around 8 to 11 ish coming out of the RO filter. I also have a flush kit on it that I use before and after. I changed the DI on 9/2/14. I packed it very tight when I did so. Tonight when I started making water the TDS out of my DI is reading 1 and it is all brown. I make about 15 gallons of water every two weeks. The DI resin only lasted for 3 runs of making water. My tap water TDS is around 288. What is causing the DI to go bad? Do I need new prefilters or an RO filter?

SFish · 10/09/2014, 09:47 PM

Here is from my log

6/9/14

PSI = 74
Cl = 0.19ppm
Rejection rate = 97%

6/23/14

Changed pre filters + DI

PSI = 72
Cl = 0.24ppm
Rejection rate = 97%

7/7/14

PSI = 72
Cl = 0.24ppm
Rejection rate = 96.68

7/22/14

PSI = 74
Cl = 0.29
Rejection rate = 95.85

8/18/14

Changed DI

PSI = 70
Cl = couldn't test because I ran out
Rejection rate = 97.3

8/31/14

Changed DI

Found out I wasn't packing DI tight enough

PSI = 70
Cl = 0.16 I'm thinking this test was messed up
Rejection rate = 96.3

9/10/14

PSI = 70
Cl = 0.29
Rejection rate = 97.4

9/28/14

PSI = 70
Cl = 0.58
Rejection rate = 96

10/9/14

DI is reading 2ppm

PSI = 70
Cl = didn't test because I stop filtering
Rejection rate = 97

I calibrate the TDS meters once a month. I've been cleaning the probes with 50% Isopropyl alcohol.

E46Twist · 10/09/2014, 11:49 PM

Are all of the pre filters relatively new?

SFish · 10/10/2014, 05:15 AM

I changed all of them on 6/23/14

E46Twist · 10/10/2014, 07:43 AM

And what are you taking your TDS readings out if? As in do you fill a little container to dip the probe in?

disc1 · 10/10/2014, 08:18 AM

Are you on a well? Sometimes well water can be high in CO2 and that can pass the membrane and burn up DI resin really fast. If you are on a well, check the pH of the incoming water. If it is below about 6.5 or so you may need to set up a degassing setup after the RO and before you put it through DI.

If you're not on a well then ignore everything I just said.

SFish · 10/10/2014, 08:48 AM

Quote:

Originally Posted by E46Twist

And what are you taking your TDS readings out if? As in do you fill a little container to dip the probe in?

No they are in line meters

SFish · 10/10/2014, 08:50 AM

Quote:

Originally Posted by disc1

Are you on a well? Sometimes well water can be high in CO2 and that can pass the membrane and burn up DI resin really fast. If you are on a well, check the pH of the incoming water. If it is below about 6.5 or so you may need to set up a degassing setup after the RO and before you put it through DI.

If you're not on a well then ignore everything I just said.

I'm on city water no well and they use Cl gas.

thegrun · 10/10/2014, 03:30 PM

How much water are you making at a time?

SFish · 10/10/2014, 05:11 PM

About 15 gallons. I make water every two weeks.

JammyBirch · 10/10/2014, 05:23 PM

Had the same problem, it is high silica in my city water. Changed the di resin almost immediately. Sucks...

SFish · 10/10/2014, 05:34 PM

I can watch it start to change brown right away at the bottom and work it's way to the top over a few uses. They must have changed something then because when I first got the filter the DI lasted 6 months. Even at the 6 month mark the resin wasn't brown but my TDS started reading 1 so I changed it. Is there a prefilter to take that crap out? What would be considered high? The filter guys said it maybe CO2. In any case I think I may need another prefilter just don't know what.

whosurcaddie · 10/10/2014, 05:50 PM

Quote:

Originally Posted by SFish

I can watch it start to change brown right away. They must have changed something then because when I first got the filter the DI lasted 6 months. Is there a prefilter to take that crap out?

If you can watch the color change then its definitely some form of gas I used to be on well water and my di would do that. You need to degas the water and then send it through your DI by way of some type of small pump. Its a hassle and an extra step nobody looks forward to but if you want 0tds water its the only way.

The way you degas is you will need an airstone in the bottom of an extra water container and let it run for about an hour and then run the degassed water through your DI stage. This is after you send it through the ro unit of course. Good luck.

SFish · 10/11/2014, 06:49 AM

Thanks

thegrun · 10/11/2014, 07:06 AM

One thing you can do to at least get full use of your resin is to add a second DI canister. You will get a lot more use out of your DI resin if you run two canisters of resin in series. When you use a single canister of resin and you start to see your TDS readings rise you need to replace the resin even though it still capable of absorbing more pollutants. If you use two canisters when you first start to see your TDS rise, remove the first canister in line and then shift the number two canister into the number one position. Then replace the resin in the old number one canister and place it in the number two position. That way you get full use of the resin.

asudavew · 10/11/2014, 08:44 AM

Are you flushing your system during startup?

+1 on the dual di canisters.

SFish · 10/11/2014, 01:17 PM

Quote:

Originally Posted by asudavew

Are you flushing your system during startup?

+1 on the dual di canisters.

Yes before and after

SFish · 10/11/2014, 01:22 PM

I found this

http://www.3reef.com/threads/now-you...or-co2.105983/

It a CO2 test for $16. Going to pick one up.

SpectraPure · 10/28/2014, 01:06 PM

If you are having a co2 problem I can help. I am very experienced in water purification and DI!

Jeremy
support@spectrapure.com

SFish · 10/28/2014, 03:03 PM

I have no idea if it's CO2 but something is eating my DI up. The CO2 kit is on it's way so I'll find out.

Thanks for answering my PM

SpectraPure · 10/28/2014, 03:16 PM

Please measure the ml/pm on the product and waste water lines for 1 minute each, and report what the TDS of the tap water, RO water, and DI water is. Also please tell me what the pressure reads on the pressure gauge.

Jeremy

SFish · 10/28/2014, 07:02 PM

I don't know what ml/pm is.

The pressure is 70PSI after the prefilters

TDS of tap water is 294ppm

TDS after RO is 10ppm

I changed the DI so the TDS is 0ppm

SFish · 10/28/2014, 07:04 PM

I posted my Log up above

SFish · 10/30/2014, 09:53 AM

Must have scared him off

SpectraPure · 10/30/2014, 12:52 PM

Chlorine gas gets removed by the carbon block. Co2 passes through the membrane only to be removed by the DI. Take a stop watch and a measuring cup to the product water for a minute, and then the waste water to report what your waste to product ratio is.

also. To get membrane rejection we take the tap water TDS minus the RO water TDS divided by the tap water TDS. Is this how you calculated your rejection?

Jeremy

10/09/2014, 08:01 PM	#1
SFish Registered Member Join Date: Dec 2013 Posts: 2,062	DI Resin getting used up fast ??? I have had my RO/DI unit for a bit less then a year now. I changed the prefilters on 6/23/14. I use to get 72 to 74 psi going into the RO but now it seem to drop to around 70. My Cl is at 0.58ppm. My rejection rate seems to be around 96 to 97 ish. I'm getting a TDS of around 8 to 11 ish coming out of the RO filter. I also have a flush kit on it that I use before and after. I changed the DI on 9/2/14. I packed it very tight when I did so. Tonight when I started making water the TDS out of my DI is reading 1 and it is all brown. I make about 15 gallons of water every two weeks. The DI resin only lasted for 3 runs of making water. My tap water TDS is around 288. What is causing the DI to go bad? Do I need new prefilters or an RO filter? Last edited by SFish; 10/09/2014 at 08:14 PM.

10/10/2014, 08:18 AM	#6
disc1 -RT * ln(k) Join Date: Sep 2010 Location: Little Rock Posts: 9,705	Are you on a well? Sometimes well water can be high in CO2 and that can pass the membrane and burn up DI resin really fast. If you are on a well, check the pH of the incoming water. If it is below about 6.5 or so you may need to set up a degassing setup after the RO and before you put it through DI. If you're not on a well then ignore everything I just said. __________________ David Current Tank: Undergoing reconstruction...

10/10/2014, 05:34 PM	#12
SFish Registered Member Join Date: Dec 2013 Posts: 2,062	I can watch it start to change brown right away at the bottom and work it's way to the top over a few uses. They must have changed something then because when I first got the filter the DI lasted 6 months. Even at the 6 month mark the resin wasn't brown but my TDS started reading 1 so I changed it. Is there a prefilter to take that crap out? What would be considered high? The filter guys said it maybe CO2. In any case I think I may need another prefilter just don't know what. Last edited by SFish; 10/10/2014 at 05:54 PM.

10/11/2014, 08:44 AM	#16
asudavew Registered Member Join Date: Jan 2013 Location: San Angelo, Texas Posts: 1,010	Are you flushing your system during startup? +1 on the dual di canisters. __________________ Be nice. Current Tank Info: 180, 125, 75

10/28/2014, 01:06 PM	#19
SpectraPure RC Sponsor Join Date: Jun 2003 Posts: 0	If you are having a co2 problem I can help. I am very experienced in water purification and DI! Jeremy support@spectrapure.com __________________ *Innovators in water technology.* Since 1985!

10/09/2014, 09:47 PM	#2
SFish Registered Member Join Date: Dec 2013 Posts: 2,062	Here is from my log 6/9/14 PSI = 74 Cl = 0.19ppm Rejection rate = 97% 6/23/14 Changed pre filters + DI PSI = 72 Cl = 0.24ppm Rejection rate = 97% 7/7/14 PSI = 72 Cl = 0.24ppm Rejection rate = 96.68 7/22/14 PSI = 74 Cl = 0.29 Rejection rate = 95.85 8/18/14 Changed DI PSI = 70 Cl = couldn't test because I ran out Rejection rate = 97.3 8/31/14 Changed DI Found out I wasn't packing DI tight enough PSI = 70 Cl = 0.16 I'm thinking this test was messed up Rejection rate = 96.3 9/10/14 PSI = 70 Cl = 0.29 Rejection rate = 97.4 9/28/14 PSI = 70 Cl = 0.58 Rejection rate = 96 10/9/14 DI is reading 2ppm PSI = 70 Cl = didn't test because I stop filtering Rejection rate = 97 I calibrate the TDS meters once a month. I've been cleaning the probes with 50% Isopropyl alcohol.

10/09/2014, 11:49 PM	#3
E46Twist Registered Member Join Date: Dec 2013 Location: Columbia,MO Posts: 328	Are all of the pre filters relatively new?

10/10/2014, 05:15 AM	#4
SFish Registered Member Join Date: Dec 2013 Posts: 2,062	I changed all of them on 6/23/14

10/10/2014, 07:43 AM	#5
E46Twist Registered Member Join Date: Dec 2013 Location: Columbia,MO Posts: 328	And what are you taking your TDS readings out if? As in do you fill a little container to dip the probe in?

10/10/2014, 03:30 PM	#9
thegrun Registered Member Join Date: Dec 2008 Location: Garden Grove, Ca Posts: 17,023	How much water are you making at a time?

10/10/2014, 05:11 PM	#10
SFish Registered Member Join Date: Dec 2013 Posts: 2,062	About 15 gallons. I make water every two weeks.

10/10/2014, 05:23 PM	#11
JammyBirch Aquaria Engineering Join Date: Mar 2014 Location: Elkland, PA Posts: 1,182	Had the same problem, it is high silica in my city water. Changed the di resin almost immediately. Sucks...

10/11/2014, 06:49 AM	#14
SFish Registered Member Join Date: Dec 2013 Posts: 2,062	Thanks

10/11/2014, 07:06 AM	#15
thegrun Registered Member Join Date: Dec 2008 Location: Garden Grove, Ca Posts: 17,023	One thing you can do to at least get full use of your resin is to add a second DI canister. You will get a lot more use out of your DI resin if you run two canisters of resin in series. When you use a single canister of resin and you start to see your TDS readings rise you need to replace the resin even though it still capable of absorbing more pollutants. If you use two canisters when you first start to see your TDS rise, remove the first canister in line and then shift the number two canister into the number one position. Then replace the resin in the old number one canister and place it in the number two position. That way you get full use of the resin.

10/11/2014, 01:22 PM	#18
SFish Registered Member Join Date: Dec 2013 Posts: 2,062	I found this http://www.3reef.com/threads/now-you...or-co2.105983/ It a CO2 test for $16. Going to pick one up.

10/28/2014, 03:03 PM	#20
SFish Registered Member Join Date: Dec 2013 Posts: 2,062	I have no idea if it's CO2 but something is eating my DI up. The CO2 kit is on it's way so I'll find out. Thanks for answering my PM

10/28/2014, 03:16 PM	#21
SpectraPure RC Sponsor Join Date: Jun 2003 Posts: 0	Please measure the ml/pm on the product and waste water lines for 1 minute each, and report what the TDS of the tap water, RO water, and DI water is. Also please tell me what the pressure reads on the pressure gauge. Jeremy __________________ *Innovators in water technology.* Since 1985!

10/28/2014, 07:02 PM	#22
SFish Registered Member Join Date: Dec 2013 Posts: 2,062	I don't know what ml/pm is. The pressure is 70PSI after the prefilters TDS of tap water is 294ppm TDS after RO is 10ppm I changed the DI so the TDS is 0ppm

10/28/2014, 07:04 PM	#23
SFish Registered Member Join Date: Dec 2013 Posts: 2,062	I posted my Log up above

10/30/2014, 09:53 AM	#24
SFish Registered Member Join Date: Dec 2013 Posts: 2,062	Must have scared him off

10/30/2014, 12:52 PM	#25
SpectraPure RC Sponsor Join Date: Jun 2003 Posts: 0	Chlorine gas gets removed by the carbon block. Co2 passes through the membrane only to be removed by the DI. Take a stop watch and a measuring cup to the product water for a minute, and then the waste water to report what your waste to product ratio is. also. To get membrane rejection we take the tap water TDS minus the RO water TDS divided by the tap water TDS. Is this how you calculated your rejection? Jeremy __________________ *Innovators in water technology.* Since 1985!