Chin sent me a PM so I thought I would just post my reply here.
I have been only using DI for about 5 years now. That being said I am metered for my water consumption, and my recollection is that it is somewhere near 4 times that of the residential rate.
My system runs a 5 micron prefilter, then 10 micron carbon then triple DI, we aim for TDS of 4 or below and then start changing the filters.
We have had issues but I cant claim they were from using DI only resin.
As for using the chemicals to recharge, not sure with the toxic nature of the chemicals, the water savings, and a value for our time that it is more "economical" to just use a few more DI Cartridges.
Wendell
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