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DOH!
I finally remembered something else that may or may not be of help:
Before vacuum degassing membranes got so cheap ($13,600 is cheap in the world of semiconductors) the big semiconductor fabs with CO2 problems used to put a bed of anion exchange resin between the RO and the mixed-bed (DI) resin. The anion resin would soak up the majority of the CO2, extending the life of the DI resin.
I suppose you could get a Kati-Ani, and put anion resin in both chambers, and put it between the RO and the DI cartridge. That way you could avoid more tanks, extra pumps, etc.
Keep us posted on your progress!
Tim
90 gallon tank waiting on remodelling at home
19,000 gallon per day RO at work
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