Another instance of someone who parrots back something they heard.
Distilled and DI water is fine for cooling systems, as recommended by every auto manufacturer I have ever seen. The water will quickly absorb metallic ions from the inside of the engine (and become saturated), an amount that is so miniscule to be immeasurable. The only time DI or distilled water is damaging to anything (due to leaching) is over a long period of time and only with flowing fresh supply (such as the output from a still). Never ever in a closed system.
Besides, what do you think RO does? Maybe you can explain it to us.
Originally Posted By: loyd
Kinetico is a reverse osmosis system and probably should be okay for a radiator. If it was also de-ionized it shouldn't be used in a radiator because DI water is hungry for ions, especially metallic ions.