I suspect DI is overkill.. one has to put SOME minerals back into the water at any rate (Cal-Mag) At the time that I got my RO unit, I did a price comparison between DI and RO based on my anticipated usage, and DI came out prohibitively expensive - no contest. In other areas the analysis could come out differently depending on local water quality. Another consideration... when a RO membrane starts to fail, TDS goes up slowly (and throughput drops) - one has plenty of warning. With DI, when the cartridge fails, it does so abruptly, so one goes from very pure to "untreated" quickly. Back in my lab days, we had two banks of DI cartridges, so when the light went out on the first we would call for service and the second would hold things until that happened, then they were swapped so we always had good water. But there, DI was mission-critical. For home use, for that safety margin, initial price gets doubled - so more overkill.
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Hybrid Mode
