Hi, sorry for jumping on this one kinda late, but I had a couple questions.
first off how do you know when you need to go to a RO over a DI system?
http://www.crd.bc.ca/water/wqData.htm this is a link to the Victoria water quality report and by looking at it I would have thought our water was good enuf for no filtration, but I have been informed otherwise.
Also by a DI unit do you mean thoes under cabnet cartrage filters from home deopt? or are they a special product?
another thing ... some one said something that struck me funny.. something about (you can use hot water with DI also) well I am sure it would work but using hot water you are risking copper contamanation. in the hot water heater water sits untill it is needed, while it sites it adsorbs minerals and such from inside the tank .. while cold water also can pick up contamanants you can run your cold water for 5 min to flush out the lines. I would think that your cartrage would last longer if you are using cold water as it won't have as much metals to remove. then again who knows, just my 2 cents
Steve