View Full Version : DI resin use

12/31/2015, 11:47 PM
I have a 180gpd Max cap system. I installed a pleated sediment pre filter to the system, as our water has a lot of tds. Incoming water is around 550-600,sometimes worse. Post r/o is 4-5. I did replace the membranes with the 99 rejection rate ones in the past. It appears that my numbers have stayed the same the same on all the tds meters as in the past.Lately I seem to be going through resin more quickly. I have double di and the first usually always would go quicker than the second chamber. Now it seems that both are getting exhausted at the same rate, and both a little sooner. Bad resin, high co2?
Any thoughts?


01/04/2016, 10:07 AM

Are you on a well? Do you make large batches of water, or is your system automated on a float.


01/04/2016, 01:18 PM
No well, yes large batches on float, but only in case I forget to shut off.I try to run 50-100 gallons at a time to avoid tds creep.

01/04/2016, 01:40 PM
What is the PH and KH of your tap water? Does your municipality use chloramines?


01/04/2016, 03:32 PM
No cloramines that I'm aware of. I'll have to double check the others, haven't tested in a while. PH used to run in the 8's.

01/04/2016, 07:20 PM
Ph. 8.1
Alk 10.0

01/05/2016, 12:24 PM
This doesn't show that you have an excessive amount of Co2. Check your municipality for the total water quality report from 2015 for chloramines


01/15/2016, 04:50 PM
Will chloramines kill a di stage even with useing a carbon filter? Or does it have to be a certain carbon to remove it?

01/15/2016, 11:51 PM
I'm still trying to get a straight answer from my city.

01/18/2016, 08:32 AM
Just use the chloramine removal cartridge anyways. Make your water in large batches. Use a chlorine test kit on the waste line to know when to change said chloramine cartridge. Check your waste to product ratio when the seasons change with the water temps to make sure that you are within 3-4:1 range. (depending on general hardness)

Also what is the TDS of your TAP and the TDS of your RO?

What is the PSI?

Lets run through the numbers to make sure everything is all good on the system.