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Thank you for sharing I’m going to have to check this out!Sounds exactly like the problem I had.
I think you're going to have to gas off the CO2. You can check out a video here about it. https://www.bulkreefsupply.com/content/post/Extend-Lifespan-of-DI-Resin-Reduce-CO2-How-To-Tuesday
Also another calculator
CO2 DI Resin Depletion Calculator
Aquarium calculator; Calculate how much of a deionization (DI) filter is depleted by carbon dioxide (CO2) alone.www.hamzasreef.com
I don't think a better RODI unit will affect this, I could be wrong and there is a product out there that I am unaware of, but I think it's bound by the CO2.