How long does your DI resin last? (1 Viewer)

[GotFrogs]

I am having issues with my DI resin lasting lest than a month on my RO system. I have always had this issue but it seems even worse now. I have am running two BRS universal carbon blocks prior to the RO, and then two cylinders of mixed color chaning DI media. Currently my water is testing about 230 TDS and 16 on the RO output and then 0 after the DI resin before it changes color. I have a 280 and two ~60 gallon tanks that the RO unit provides water for.

How long does your media last? Any suggestions?

 

[RR-MAN]

You know I’m having the same issue lately.

I’m running prefilter>2 chloramine carbon>ro membrane>2 di resin (color changing)

Put in two DI resins not long ago and I’m already getting 2 TDS.


Saw this post from nick- city of Bellaire also does not have a M.U.D similar to Pearland.
Wondering if this could be my problem.

 

[mikster]

I run my di resin after my membrane and it last a very long time. I get 2ppm tds coming out of the membrane though

 

[webster1234]

Your rejection rate on your membrane is 93%. 16 TDS/230 TDS = .067 or 6.7%. That means 6.7% total dissolved solids are still getting past the membrane and its up to your DI resin to remove them. That is why your DI is wearing out so fast. Most cheap membranes from BRS are 94% rejection, and Spectrapure sells some 98% membranes for a $20 premium. Bottom line, your membrane is wearing out and should be replaced. That will make your DI resin last longer.

Now...what causes your membrane to wear prematurely? Usually the chloramines in your water. The only way to lower those is to run two carbon blocks (which I see you are) and rotate them often. I run two carbon blocks and every time I change the pre-filter, I move the #2 carbon to the #1 spot and install a new carbon in the #2 spot. I can't tell how much this has helped but it seems my 98% membrane has lasted a little longer than the last one. But even my 98% is reading 94% now and I am burning more DI than when it was new.

I think we can all agree that our city water is pitiful.

 

[Ostentum]

I am getting around 1000g now that I added a water softener to the house. Seems the resin lasts longer when it’s removing mainly sodium chloride as compared to all the heavy metals

 

[Reefahholic]

You have to bleed the TDS creep off the membrane before you run through the DI stage. I hooked up a TDS meter so that I can see my TDS coming in before it goes through the DI stage.

The TDS will commonly be 200+ on the initial start up. If you send that 200+ TDS through your DI stage- it will burn up the risen rapidly. So if you hook up a John Guest “3-way valve” and bleed off the high TDS before it runs through the DI stage, your DI resin will last 6-9 months or longer. Mine lasted about 9 months this last time. I finally started reading 1 TDS on the “Out” about 3 days ago so I re-packed it. Should last me another 6-9 months depending on how much water I’m making.

 

[Reefahholic]

 

[Reefahholic]

$20 @ BRS

$16 @ USplastics

3-Way Ball Valve with John Guest 1/4" Push Connect

 

[PorpoiseHork]

You have to bleed the TDS creep off the membrane before you run through the DI stage. I hooked up a TDS meter so that I can see my TDS coming in before it goes through the DI stage.

The TDS will commonly be 200+ on the initial start up. If you send that 200+ TDS through your DI stage- it will burn up the risen rapidly. So if you hook up a John Guest “3-way valve” and bleed off the high TDS before it runs through the DI stage, your DI resin will last 6-9 months or longer. Mine lasted about 9 months this last time. I finally started reading 1 TDS on the “Out” about 3 days ago so I re-packed it. Should last me another 6-9 months depending on how much water I’m making.

Pretty much this. I'm running two small DI 3/4# canisters with mixed resin then to a large 10" canister running a different brand of DI resin and if I don't purge the RO membranes first, the DI resin in the small canisters will last at best 2-3 months. This causes my TDS to jump to 2 and will exhaust the 10" in a matter of month from there. If I do purge it I get a good about 5 months out of the small ones and the large will last nearly a year before it starts changing color.

 

[RR-MAN]

I run my di resin after my membrane and it last a very long time. I get 2ppm tds coming out of the membrane though

Yes of course - i had the order wrong. RO and then DI.

Your rejection rate on your membrane is 93%. 16 TDS/230 TDS = .067 or 6.7%. That means 6.7% total dissolved solids are still getting past the membrane and its up to your DI resin to remove them. That is why your DI is wearing out so fast. Most cheap membranes from BRS are 94% rejection, and Spectrapure sells some 98% membranes for a $20 premium. Bottom line, your membrane is wearing out and should be replaced. That will make your DI resin last longer.

Now...what causes your membrane to wear prematurely? Usually the chloramines in your water. The only way to lower those is to run two carbon blocks (which I see you are) and rotate them often. I run two carbon blocks and every time I change the pre-filter, I move the #2 carbon to the #1 spot and install a new carbon in the #2 spot. I can't tell how much this has helped but it seems my 98% membrane has lasted a little longer than the last one. But even my 98% is reading 94% now and I am burning more DI than when it was new.

I think we can all agree that our city water is pitiful.

Nothing has changed for me for the last 4 years except buying my DI resin from BRS. I used to buy from buckeye and without any issues it lasted me at least 6 months. Only issue with Buckeye was the higher shipping prices. I probably need to go back to Buckeye. Now I know all Di resins are not created equally.

You have to bleed the TDS creep off the membrane before you run through the DI stage. I hooked up a TDS meter so that I can see my TDS coming in before it goes through the DI stage.

The TDS will commonly be 200+ on the initial start up. If you send that 200+ TDS through your DI stage- it will burn up the risen rapidly. So if you hook up a John Guest “3-way valve” and bleed off the high TDS before it runs through the DI stage, your DI resin will last 6-9 months or longer. Mine lasted about 9 months this last time. I finally started reading 1 TDS on the “Out” about 3 days ago so I re-packed it. Should last me another 6-9 months depending on how much water I’m making.

I think we discussed this before. My unit has an automatic flush. It's the vertex puratek. So can't be that.

 

[Reefahholic]

Yes of course - i had the order wrong. RO and then DI.




Nothing has changed for me for the last 4 years except buying my DI resin from BRS. I used to buy from buckeye and without any issues it lasted me at least 6 months. Only issue with Buckeye was the higher shipping prices. I probably need to go back to Buckeye. Now I know all Di resins are not created equally.



I think we discussed this before. My unit has an automatic flush. It's the vertex puratek. So can't be that.

So what is your TDS going in? If it’s low then you need to check your CO2 in the source water and check to see if you’re packing the media tightly in the DI canister.

 

[GotFrogs]

You have to bleed the TDS creep off the membrane before you run through the DI stage. I hooked up a TDS meter so that I can see my TDS coming in before it goes through the DI stage.

The TDS will commonly be 200+ on the initial start up. If you send that 200+ TDS through your DI stage- it will burn up the risen rapidly. So if you hook up a John Guest “3-way valve” and bleed off the high TDS before it runs through the DI stage, your DI resin will last 6-9 months or longer. Mine lasted about 9 months this last time. I finally started reading 1 TDS on the “Out” about 3 days ago so I re-packed it. Should last me another 6-9 months depending on how much water I’m making.

I have a booster budy pump that does this.
Link to Pump

 

[Reefahholic]

I have a booster budy pump that does this.
Link to Pump

It flushes for 18 seconds. What is you’re “IN” reading after the flush?

 

[Reefahholic]

I have a booster budy pump that does this.
Link to Pump

Check for CO2 buildup also.

What is the pH of that water?

 

[Reefahholic]

pH-KH-CO2-Calculator for your aquarium