Deionization resin will take the purified water coming from your RO membrane and further purify it. If your tap water is for example 200 ppm TDS, your RO water might be 6 ppm TDS, and your DI water would be 0 or 1 ppm TDS.
RE the resin - well, hmm. Our favorite water purifiecation vendor has nuclear grade color changing resin, in a larger quantity (20+ oz), for a lesser cost.
I suspect a vendor selling resin in 18 oz allotments indicates that vendor uses small, horizontal DI cartridges on their systems.
Russ



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This is the unit I have. 100gpd



