High TDS after separated cationic and anionic resin

[Charles Silva]

Hello all


I replaced my filtration system resins (cationic and anionic) and I´m getting high TDS values.


Here is the configuration:

1- 2.5"x 10" 20 micron sediment filter
2- 2.5"x 10" 5 micron sediment filter
3- 2.5"x 10" carbon block filter 5 micron
4- 2.5"x 10" 1 micron sediment filter
5- RO - 75 GPD
6- 2.5"x 10" Cationic Resin Purolite C100
7- 2.5"x 10" Anioni Resin Purolite A400
8- 2.5"x 10" Mix Resin Purolite MB400

To measure the TDS I´ve been using this HM COM-100 meter and all the measurements were taken at the same way with the tested water entering from botton and and leaving from the top of my measure cup with the meter centered not moving.

The pressure before RO is 62 psi
waste water 310 mL/min
produced water 180 mL/min
RO rejection rate= 94% (29.5 ppm in vs 1.7 ppm out)


The TDS numbers are:

Tap water = 29.4 ppm
Pre-filters out = 29.4 ppm
RO output = 1.3 ppm
Cationic and Anionic water output = 7 ppm


I already run 80 liters of water in my new cationic and anionic (separated resins) and I´m still getting high TDS.

I kindly would like your advices if I need to run more water or if I can run my last stage with new mixed resin ? In this case my concern is if the cationic and anionic resin output is high if it will damage my mixed resin.

what is causing this high TDS output ?

Thanks in Advance
Charles Silva

 

[Randy Holmes-Farley Verified Community Expert]

If one of the two resins is depleted, or water is channeling through one of them, the TDS will be higher than the input fluid and the pH will be either very high or very low.

 

[P-Dub]

How long have you been running the resins?
Edit, And, Randy beat me to it.

 

[Val Shebeko]

Depleted resin. I think.

 

[Charles Silva]

The cationic and the anionic resins are new and came in a vacum sealed pack.
I already run 120 L - RO water entering the 2 DI chambers with 1.3 ppm and leaving the resins with 6.8 ppm

 

[W1ngz]

Are you sure the cartridges are well packed? Are they mounted horizontally or vertically on the wall?

 

[Randy Holmes-Farley Verified Community Expert]

Perhaps they were not packed well into the cartridges, so some water is channeling through without interacting with the resin.

 

[AZMSGT]

If you need further assistance on this this Video from BRS might help. I knew allot of this stuff too and it still gave me a tad bit more insight. Worth a look

 

[Mical]

Double check that cartridges are not upside down in the the canister. I did that once...duh. Black rings to the top