High TDS on first DI resin canister

[hockeyhilite]

Just now opened and started using the RO/DI 7 Stage pro system from BRS (ordered in Dec). It seems my TDS is 10-11 on my Cation canister and the other two are at zero. Any ideas?

 

[KStatefan]

Cation is first so not all will be removed. Do not measure in between the cation and anion.

 

[hockeyhilite]

Cation is first so not all will be removed. Do not measure in between the cation and anion.

Thank you!! Such a newb here. Glad we have places where you can get valid input.

 

[Randy Holmes-Farley Verified Community Expert]

Folks often do not understand this, but a cation only or anion only di resin should raise the tds of the water passing through them because the H+ and OH- they release are more conductive than ANY other ions they are swapped for.

It is only after passing through both that the H+ and OH- combine to form nonconductive water that the tds drops.

 

[hockeyhilite]

Folks often do not understand this, but a cation only or anion only di resin should raise the tds of the water passing through them because the H+ and OH- they release are more conductive than ANY other ions they are swapped for.

It is only after passing through both that the H+ and OH- combine to form nonconductive water that the tds drops.

I really appreciate this knowledge. It’s very exciting during the salt mix process. It means I’ve only touched the surface when filling tank #1.