How often do you change your DI Resin?

K

kelipalmer

Premium Member
I'm curious how often others are needing to change out their DI Resin. I have a 4 stage RODI and I use BRS DI resin. My TDS from the RO stage into the DI stage is typically 4-6 PPM. After about a month, I no longer get 0 TDS out the DI stage. This corresponds to the DI "beads" changing from blue to brown. I make about 80-100 gallons of water RODI water per month. It seems that I'm blowing through DI Resin but maybe this is normal.
 
We have to change ours pretty often as well. Not sure exactly how often but once a month sounds about right. We have aweful water here in Wilow Park!!
 
Are you running well water? How often do you change the membrane and prefilters? It should last longer than that IMO.
 
@franklypre wrote:
Are you running well water? How often do you change the membrane and prefilters? It should last longer than that IMO. said:
It's city-processed water but it's also pretty hard water so it goes through a softener before the RODI. I change the prefilters every 6 months. I've not changed the membrane but the TDS numbers out the membrane seem to indicate it is still working within the normal efficiency range.
Click to expand...
 
I change my sediment and carbon filters after about 800 gallons. The DI lasts between 1600-1800 gallons before it shows TDS >0. As soon as I see any TDS, THE DI gets changed and I go ahead and change out the sediment and carbon filters again. My system has made about 4000 gallons so far and is still on the original RO membrane.
 
I change mine every six months just because I get 1 TDS before my Dual DI and then 0 TDS after DI I use about 5000-6000 gallons of in coming water every 6 months and my TDS is the same before I change the filters and one DI is almost used up about that time I have color changing.
 
You may need to consider doing this to save DI:
[video]http://youtu.be/JWbKnsT-kLw[/video]

Also, how often are you running the RO system? If it cycles on and off several times a day ... usually if you hook it up directly to your sump, you'll consume the DI more quickly and the membrane won't last long either.
 
First filter ever 3 months, second and third every 6 months, di about once a year or >0 TDS after DI and membrane about every 24 months.


Sent from inside the shark tank!
 
@Marc wrote:
You may need to consider doing this to save DI: [video]http://youtu.be/JWbKnsT-kLw[/video] Also said:
Thanks Marc. I already follow your procedure. I run the RO system once a week to make top off water and water for the next water change. It is not automated.
Click to expand...
 
So it seems to me that our DI resin is being used up much faster than "normal." Suggestions on what to do about it?
 
When I shot this video, my resin lasted a long time because I didn't use as much water as I do now. I change out my resin every 3-4 months now.
 
I changed out my resin before summer, for the first time. My tds read zero but figured I change it. I also have my rodi system hooked directly to my sump, via a 15 gallon reservoir. My waste is constantly running and when I called brs, they too mentioned not to run it 24/7 to prolong the membrane. I will shut it down to see how long the reservoir lasts, mainly out of curiosity. They also mentioned same as you did Marc, I need to measure the ratio. Just too cold for me at the moment.

~Matt
 
I saw this video from BRS tv yesterday and I think it explains my situation. I'll try "aerating" my RO water before running it through the DI resin and see what happens.
http://enews.bulkreefsupply.com/q/4Hauxi7zTyfrg84UkW6gKIRv5FpxkrYPeVGgxwBxuEheAWOGsxAclPcad
 
I agree with Marc and with the BRS people....but, I would strongly suggest you test for CO2 before you start making decisions. You just might have gotten a bad suppler of the resin and it was already almost burned out....I have done it.
 
6-8 months and I don't change till it shows 2 TDS, I doubt 1 TDS is gonna hurt anything , plus when was you meter calibrated last ? Mine is showing about
25% still blue and has been 1 for 2 months, when it goes all brown it usually still good for a while.
 
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