Can we gat a detailed picture or video on this set up, I really need to go this direction, but my system is 100% automated and has complications to do this, an example of yours would be greatly appreciated and helpful to implement into mine.I have a well and was running through resin quickly as well. Changed to a 3 stage DI and only the Anion was being depleted quickly. Found out it was CO2 so if it is only your Anion you can probably safely assume it’s CO2, if it’s both then you have other issues.
I ended up just adding a second trash can. Now I run through my RO into the first trash can at around 3 TDS from 600+…I have an air stone in this trash can and let it off gas for a couple days or more depending on needs. Then I pump it through my DI into the final trash can and barely notice any DI resin usage at this point. Honestly wish I hadn’t upgraded to the 3 stage because it’s completely unnecessary for the amount of water I use but I have made around 500 gallons with the new setup and can barely see any resin discoloration so far.