How to recharge DI resin

Hi guys, have done the process on about 5 litres of resin, Im a bit worried, Im storing mixed resin that I have recharged in ziplock bags, there is moisture throughout, do they have to be completely dry before mixing and storing?

I hope this works as its a lot of work!
 
Sisterlimonpot said:
After doing this for a few years now, I have simplified my approach and keep the anion and cation separated. I just added a second DI container to my system. So now the RO water flows through the cation and then the anion.

.
Click to expand...

I have read in the thread that it works better when mixing the beads??
 
Well just filled my 12 litre canister with the resin I had charged for the first time, and got 0ppm straight away! Very pleased as it was a fair bit of work so will find some larger utensils to use so I can do it quicker next time. Great info and forum guys!
Cheers
Mike
 
Mixed bed resins will produce lower TDS water. But if you provide a bit greater volume of separate bed resins you should get the same result.
 
We produce 7000ltrs a day of DI at work with seperate beds (2 x 40kg canisters) and found we could never get a zero TDS on the first pass. After recirculating it through the separated beds it's ok. Tried it at home also with separate beds, same result. Mixed bed gives better results, and separating the bed is really no problem when it needs to be regenerated.
 
It all depends upon what sort of resin you are regenerating.

If it was cation resin in the NA form (i.e., typical softening resin), then yes.

If it is mixed bed resin (cation beads and anion beads mixed together), and they were in the H form and OH form (rather than Na form), then no.

Russ
 
Thanks for sharing with us but risks are high and when i say risks that means risks of getting those chemicals in the tank while making new RO water using recharged DI resin. I buy resin with my friend from ebay and we order 10lbs and then we split 5 lbs each and it last log enough time. but great thread...
 
the odds of getting those chemicals into your tank are slim to none as long as you rinse the resin out well and make sure you have 0 tds before you start making water your perfectly safe, i've been doing it for 5 years with no ill effects and have saved countless ammount of money.
 
bkvanbek said:
Wouldn't salt brine, like a softener uses, work to regenerate DI resin?
Click to expand...

Remember that we're talking about Ion Exchange resin, so if you recharged with sodium chloride and used it, salt would be what comes out in the final effluent, which would increase the salinity in your tank. Regenerating with a strong acid (H+) and strong base (OH-) would result in water (HOH) coming out of the final effluent.
 
So how long does resin usually last until it's not worth regenerating anymore. I have resin from spectrapure but I've heard that each time you regenerate it's capacity becomes less and less. Or is the loss negligible ?

New here btw :) and info is appreciated!
 
My experience with mixed bed resins and regenerating in place is about 5 years for a batch of resin. When the beds are kept separate, cation resin in one bed and anion in another, the resin can last twice that long. Biggest problem is ferric iron precipitate. The water here has a lot of iron in it, which by removing it before the demineralizer keeps the iron from fouling the resin. As you'd suspect, how long the resin lasts depends on multiple factors, mostly related to the composition of the feedwater.
 
How to recharge DI resin

.Rolex said:
So how long does resin usually last until it's not worth regenerating anymore. I have resin from spectrapure but I've heard that each time you regenerate it's capacity becomes less and less. Or is the loss negligible ?

New here btw :) and info is appreciated!
Click to expand...


At work we auto regenerate separate cation and anion resin upto twice a day and it lasts two years between renewals.
 
yardboy said:
My experience with mixed bed resins and regenerating in place is about 5 years for a batch of resin. When the beds are kept separate, cation resin in one bed and anion in another, the resin can last twice that long. Biggest problem is ferric iron precipitate. The water here has a lot of iron in it, which by removing it before the demineralizer keeps the iron from fouling the resin. As you'd suspect, how long the resin lasts depends on multiple factors, mostly related to the composition of the feedwater.
Click to expand...

Brummie said:
At work we auto regenerate separate cation and anion resin upto twice a day and it lasts two years between renewals.
Click to expand...

Awesome, I'm running separate beds btw
 
Sorry if this was asked here already. I have started recharging my DI resin and was able to save my lye solution and muratic acid by straining the resin back into the mixing containers then rinse the resin over my waste water pail (containing my ice cold tap water). My question is if anyone knows how many times you can recharge resin in the same acid and lye solution? And why Anion resin comes to the top but doesn't float? Makes for separation difficult. BTW I followed this article http://www.reefkeeping.com/issues/2008-09/nftt/index.php to do my recharge.
 
I am not a chemist by any stretch of the imagination, but I believe you can not or should not reuse the solutions (lye and muratic acid). They are a one time use only.

If your solution is not strong enough, the resin will not float all the way to the top.
 
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