Even though it is a tedious process, I would go the distilled (or DI) water route. Again, this procedure minimizes hardness in the cooling system which is the culprit for scale and even water pump seal erosion.
BTW, I have been using DEXCOOL for over 5 years now (changed it once already), with no problems whatsoever.
In my opinion, the bad DEXCOOL rap is somewhat the same as the now dead synthetic oil rap. Something new and promising always meets with resistance and suspicion.
