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Distilled v. Deionized H20

opfor2

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which is better for the cooling system, deionized or distilled water? which would be considered "Pure" water ?
 
opfor2 said:
which is better for the cooling system, deionized or distilled water? which would be considered "Pure" water ?

Deionized is better for aluminium. It is what I run. I also run the Honda coolant. It is blue. It is deionized.
 
Both are technically pure however distilled is just fine for your radiator. The thinking behind this is it has been boiled which leaves all minerals and particulate behind, the steam is condensed into water which is "pure" this will prevent deposits from the water be left behind in your coolant system. Deionized water is the same thing that is passed through an ion filter bed which then makes the water 100% pure so pure it will not boil at the standard 212 F and so pure you can spray it on electrical equipment and not be shocked it is how they was highpower lines to prevent hot spots from dirt build up. There is no need for the extra cost of DI water. Granted I am in the military but our DI water costs us about $10 per gallon.

Ira
 
If it were me, I'd use distilled water because deionized water is pretty hard to come by in Murphy, NC. But both are considered to be 'pure' water.
 
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