DI Resin quickly spent

[HB Fisheye]

I seem to be going through DI resin much faster than usual. I think it's because I recently changed the membrane. Could that be why? Did I not run enough water through after changing it?

 

[KStatefan]

What is the rejection rate of the membrane?

 

[HB Fisheye]

What is the rejection rate of the membrane?

Sorry, not sure what you mean.

 

[kamla]

Sorry, not sure what you mean.

find what ur TDS is before the unit
and then after the Unit But before the DI ..

and post those numbers

 

[HB Fisheye]

@KStatefan , I'm not sure what the rejection rate is. I would imagine the rejection rate would be listed on the packaging but I no longer have it.

 

[HB Fisheye]

find what ur TDS is before the unit
and then after the Unit But before the DI ..

and post those numbers

Thanks. I'll get those numbers.

 

[KStatefan]

(TDS In - TDS Out)/TDS In

 

[pdxmonkeyboy]

You may have elements in your water that just exhaust your DI faster. I have some metal in my water.. forget which one and I ended up going with the BRS three stage DI system. It is cat ion, anion, and combo DI in three separate canisters. That way you can just replace the one that gets exhausted the fastest. anion in my case. Plus.. NOTHING gets through that DI system.
https://www.bulkreefsupply.com/trip...mIYAtvH-IBGXc7xDNPV4VmBskqqdAnIBoCAAoQAvD_BwE

 

[HB Fisheye]

find what ur TDS is before the unit
and then after the Unit But before the DI ..

and post those numbers

Ok, numbers are in.
TDS going in to the unit is 474
TDS after the unit, but before DI is 18

 

[HB Fisheye]

(TDS In - TDS Out)/TDS In

So, (474-18)/474=0.962

So the reject rate is 0.962?

 

[HB Fisheye]

You may have elements in your water that just exhaust your DI faster. I have some metal in my water.. forget which one and I ended up going with the BRS three stage DI system. It is cat ion, anion, and combo DI in three separate canisters. That way you can just replace the one that gets exhausted the fastest. anion in my case. Plus.. NOTHING gets through that DI system.
https://www.bulkreefsupply.com/trip...mIYAtvH-IBGXc7xDNPV4VmBskqqdAnIBoCAAoQAvD_BwE

Pretty cool. Didn't even know that existed. Thanks for posting.

 

[ca1ore]

You may have elements in your water that just exhaust your DI faster. I have some metal in my water.. forget which one and I ended up going with the BRS three stage DI system. It is cat ion, anion, and combo DI in three separate canisters. That way you can just replace the one that gets exhausted the fastest. anion in my case. Plus.. NOTHING gets through that DI system.
https://www.bulkreefsupply.com/trip...mIYAtvH-IBGXc7xDNPV4VmBskqqdAnIBoCAAoQAvD_BwE

I recently bought this and have been very happy with it. I was chewing through the standard DI resin after about 200 gallons (not that bad, I guess). After switching to the triple system, only the anion resin has so far shown any color changes. It’s about 1/4 spent after close to 200 gallons. Much better way to do it.

 

[HB Fisheye]

I recently bought this and have been very happy with it. I was chewing through the standard DI resin after about 200 gallons (not that bad, I guess). After switching to the triple system, only the anion resin has so far shown any color changes. It’s about 1/4 spent after close to 200 gallons. Much better way to do it.

Thank you. I just looked up the most resent DI I bought. I got it from BRS but it didn't say mixed bed or anything like that. So I'm not sure what it is.
So I have the two little canisters on my RODI system full of DI resin. If I use the Triple DI saver do I eliminate those completely and just use the Triple DI saver?

 

[ca1ore]

It’s probably listed on BRS as bulk deionization resin, but if you look in the product details it is a nuclear grade mixed bed resin. The triple can certainly replace what you have currently, though there’s nothing wrong with still running them after the triple. I run mine ..... prefilters ..... booster pump ...... RO membrane ..... DI triple ..... single bulk deionization ....

 

[lolmatt]

If you're packing your own resin, make sure it's packed tight. Loosely packed resin can cause tds to creep up before the resin is truly exhausted.

 

[KStatefan]

So, (474-18)/474=0.962

So the reject rate is 0.962?

Yes or 96.2% What was the rate of your old membrane?
If it was 98% you would be now sending almost twice as much TDS to your DI filter and about half the life you previous resin life.

 

[HB Fisheye]

Yes or 96.2% What was the rate of your old membrane?
If it was 98% you would be now sending almost twice as much TDS to your DI filter and about half the life you previous resin life.

Wow. Interesting. So as far as reject rates go, the higher the number the better?
I don't know what my previous membrane was.
Could it be I bought a poor quality membrane. Shouldn't be, the dang thing was expensive.
Assuming the membrane is a good quality one. Maybe the DI triple filter is the was to go.
Thank you for your help.

 

[JoshH]

Wow. Interesting. So as far as reject rates go, the higher the number the better?
I don't know what my previous membrane was.
Could it be I bought a poor quality membrane. Shouldn't be, the dang thing was expensive.
Assuming the membrane is a good quality one. Maybe the DI triple filter is the was to go.
Thank you for your help.

How long ago did you purchase the membrane? And how did you store it?

 

[KStatefan]

Wow. Interesting. So as far as reject rates go, the higher the number the better?
I don't know what my previous membrane was.
Could it be I bought a poor quality membrane. Shouldn't be, the dang thing was expensive.
Assuming the membrane is a good quality one. Maybe the DI triple filter is the was to go.
Thank you for your help.

Yes the higher the number the better.
96% Is the minimum listed for a filmtec membrane and 98% stabilized.
There are companies that sell treated membranes that are higher than that.

 

[ca1ore]

If you're packing your own resin, make sure it's packed tight. Loosely packed resin can cause tds to creep up before the resin is truly exhausted.

Yes, very important; though no matter how hard I try I can never get 100% of the single fill pouches into the inner cannister.