Subsequent anion stages after cation

[aecombie]

I decided to add two anion stages after my cation because I’ve been getting 0 TDS after my anion stage, and my mixed bed stage didn’t appear to be doing anything until my anion resin would get depleted. However, now that I have two subsequent anion stages, I’m getting 0 TDS after the first anion resin bed, but then I’m somehow getting TDS after the final anion stage, which would be the water being used for the tank. The product water also has an anion resin smell too it. If I run the system for about 15 minutes, the final stage will produce 0 TDS eventually, but this has to be done every time I need water. Is there a reason / fix for this? The anion resin in both cartridges come from the same batch.

 

[P-Dub]

That's a really great question and I am certainly interested in the answer to this as I have tried this same setup and experienced the same thing. Anybody else run cation-anion-anion in their 7 stage RO/DI setups. As well, have you noticed the same thing happening and why would there be dissolved solids after the second and final anion cartridge? @Randy Holmes-Farley , #reefsquad
As well, I see you haven't yet posted up an intro in the Meet & Greet Forum
Welcome!