Okay Christy, was curious about that. It wouldn't make sense for DI to be exposed to the water first because it removes more than RO does and you'd exaust your DI quicker. This way, (RO first) the RO unit removes somewhere around 90%-95% of the contaminants and the DI removes the rest.
Your idea about maybe the DI resins have something on them is a good thought, I didn't know that they needed to be kept moist (DOH I remember hearing that now) That sure would make sense then.
Doug
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