Filtering capacity of DI resin (1 Viewer)

[tmgrash]

How many gallons of water should DI resin be able to take 8 tds to 0?

I just changed my DI resin made 75 gals of water which it was reading zero after. That was two days ago, today it's reading 8 after DI. What gives. I previously thought my inline tds meter was wrong because tds was reading high, i since bought a tds handheld meter and it confirms inline readings.

 

[flexrac]

hmmm, how old is the membrane? also did you pack the di resin in real tight?
i know you are no fool, but sometimes we miss stuff.

 

[tmgrash]

Membrane is newish, 5 months. Tap 477 tds, 8 after membrane and after about 100 gals DI seems deplenished. This has been going on, as I stated before I thought my inline tds meter was simply wrong but with a second meter now confirming I'm puzzled. I also bought cgac to remove the chloramine that league city has recently started using. Maybe buckeye will chime in. Oh yeah, DI packed in real tight.

 

[Ostentum]

Never had issues with the spectrapure DI resin. I have probably made around 300g so far and still doing well.

 

[tektite]

That seems awfully fast, how old is the resin? Any chance it wasn't sealed airtight for a time?

 

[tmgrash]

I agree it's odd.... It was vacuum sealed. Bought 5 refills at a time for the free shipping. Burnt through the whole batch in about 6 months. I am completely hoping it was just a bad batch, because I have no answers beyond that.

 

[paraletho]

Travis if this started soon after the change to chloramines there is your answer. We experienced the same thing last year when Port Arthur started using them. I added a third DI in line and started regenerating my resin. Keep your RO filter backflushed well as chloramine can burn a hole in it causing more load to hit your resin. The reefers up north are complaining that the water utilities up there have started adding phosphates in the winter. It is like they hate reefers anything they can do to make it harder on us. I feel your pain.

 

[angel4]

I am in League City too and never had tap's reading so high. Mine usually ran 200-240.

What kind of membrane do you have? Mine only rejects 90-95% which would take 200 to 20 or 10 tds and that is very good in itself.

Did you say your membrane can take tds of 477 down to 8? Maybe your tds meter is off?

If is not, you can try to remix and repack the resin.

I'd packed the resin very very tight and then found out after a few weeks, it had become not so tight. Remix and repack helped take tds to 0-1 again.

 

[Andy]

Buckeye has the Chlorimine buster that gets rid of chlorimine before it hits the R/o membrane

 

[Mtaswt]

I go through the same thing......I've just learned to accept it and change it out probably WAY more often than other do. I'm lucky to get 100 gallons out of some DI resin. My TDS before it hits the DI resin is around 15-20. I'm on well water if that makes a difference?

 

[tmgrash]

I am in League City too and never had tap's reading so high. Mine usually ran 200-240.

What kind of membrane do you have? Mine only rejects 90-95% which would take 200 to 20 or 10 tds and that is very good in itself.

Did you say your membrane can take tds of 477 down to 8? Maybe your tds meter is off?

If is not, you can try to remix and repack the resin.

I'd packed the resin very very tight and then found out after a few weeks, it had become not so tight. Remix and repack helped take tds to 0-1 again.

Have two tds meters both read the tap at 440-480. 98% rejection membrane make 7-10 pretty close. I wonder if the drought has made the water have a higher tds. I have the chloramine catalyst from buckeye, just recently, I thought it was going to solve my problem. I'll try to repack hopefully that helps. This is frustrating

 

[angel4]

Don't forget to remix the resin. It's very important.

 

[Buckeye Hydro]

With 8 ppm in your RO water, you should be able to get about 650 gallons out of a DI cartridge. If you have chloramines, then your DI is also taking out the ammonia left over by the chloramines, and this may be at least part of the cause of your short resin life.

Russ

 

[GotFrogs]

I am glad I am not the only one who has this problem!

 

[Buckeye Hydro]

Assuming you have been using color changing resin, when your resin needs to be replaced, does it change color at the top or bottom of the vertical DI cartridge?

 

[tmgrash]

Assuming you have been using colr changing resin, when your resin needs to be replaced, does it change color at the top or bottom of the vertical DI cartridge?

. I have not been using color changing. Something has got to be off. I just changed it again, packed it extremely tight and just a couple days later just using it to top off the tank the DI is already spent. Could I have gotten a bad batch?

 

[Buckeye Hydro]

In nearly 15 years of working with RO and RODI systems, we've had that happen once (about 10 years ago). We use top shelf resin in our systems, so it CAN happen, but it is very rare. Not sure where you got the resin you're using, how old it is, how it was handled/packaged, its quality, etc - so hard to say anything specific re your resin.

Feel free to give us a call when you are in front of your system if you'd like help troubl;eshooting it. We're in the shop all day today.

Russ
513-312-2343

 

[Andy]

I have had similar problems Travis. Russ & I have discussed this same exact problem about a month ago. I even bought a new dual meter in case mine was off.


I thought the same about the resin. I tend to buy the refill size & was afraid I had kept it too long.

I was getting higher readings after my DI then going into DI.

RUSS, which way should it change color? top to bottom or bottom to top?

 

[Buckeye Hydro]

Assuming you have a vertical DI cartridge, and that it is plumbed correctly, flow should enter the bottom of the cartridge and exit the top, so color change should start at the bottom.

If you ever see it start at the top - that's due to something else - not the DI resin exhausting.

Russ

 

[tmgrash]

I have had similar problems Travis. Russ & I have discussed this same exact problem about a month ago. I even bought a new dual meter in case mine was off.


I thought the same about the resin. I tend to buy the refill size & was afraid I had kept it too long.

I was getting higher readings after my DI then going into DI.

RUSS, which way should it change color? top to bottom or bottom to top?

Did you figure out what the issue was? Mine also will come out higher than before it went into the DI

Russ, I am using your DI. I bought a box less than a year ago. It was stored in the vacuum sealed bags in a cupboard. Also I am using a vertical chamber. Thanks for your help Russ