RODI questions...

rcillig · Sep 20, 2020

Ok so I've had my RODI for almost a yr, never changed anything and after watching a video it dawned on me maybe that I better check this out... ok So I got a Koolermax AR-122 7 Stage RODI, got me a tdi meter from BRS, and just installed it and I got 7 after the membrane and 6 on my output. Untill yesterday I didn't know the DI resins changed color, mine hasn't fully changed but it about 80% on both DI chambers. Before I got and order replacement my question is do I need everything or just DI resin ? On the website, it says the membrane is good for 2-3 years but with me getting 6tds right after it, that means its bad, correct?

As always thanks for any help guys.....

Lasse · Sep 20, 2020

IMO - it is a normal figure just after the RO process. I normally run my aquarium on that. New DI resin will take it down to near zero.

Sincerely Lasse

firmefatboy799 · Sep 20, 2020

just swap the resin that's what its there for to finish everything

KStatefan · Sep 20, 2020

The way to tell if the membrane is still working is to look at the rejection percentage. Replace the DI. I would also test the to see if your waste water has ammonia in it to see if your carbon is working.