Christy,
Using the DI will only remove magnesium and calcium from the water, and the small ro units is meant to only polish the remaining 5-10% that slips past the RO membrane. The RO membrane does so much more than remove Ca and Mg hardness from the water, such as other trace poisonous metals, bacteria, and viruses, etc etc.
You can get a booster pump for your RO which increases your system pressure and production, for about $100.
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