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Deionized vs. Sterilized vs. Tap water

post #1 of 9
Thread Starter 
As far as I know, you should never use tap water in the cooling loop. In this thread the thing I want to know is why to use the distilled water. Is it the minerals in the water or the bacteria? I'm asking because I bought some sterilized water (not distilled) which is apparently purified using reverse osmosis, which, as far as I know, doesnt remove the minerals but only the bacteria from the water. I'm just wondering if it is okay to use this kind of water or do I need to use distilled?
post #2 of 9
No that should work fine but you still need to add a antimicrobia of some kind like a kill coil or pt nuke thumb.gif
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post #3 of 9
Distilled water lacks the minerals found in tap water. Ever left some typical, hard tap water sit in a glass for a week? As it evaporates, you get a pretty nasty, hard white film that builds from the left over calcium and other deposits. The same will happen in a computer loop, as well as the possibility of nasties feeding off it and growing (mold/algae).

RO water is much better, but will still have some impurities. I've heard you can run this without much issue, though distilled is best and typically cheaper (unless you have an RO system in your house).
 
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post #4 of 9
Thread Starter 
The problem was that I was unable to even find any distilled water from Finland. I only found deionized water but no distilled. Thanks for answering, and yes I have a kill coil and 1 drop of PT nuke in my system with the water. If anyone has experiences of it, the water is made by "Fresenius Kabi" (code 12EFS23).
post #5 of 9
get 2 glass bottles and some straws and distill it yourself, its kind of easy tongue.gif
post #6 of 9
I've heard de-ionzied water doesn't play nice with the metal in blocks.

As Haz, said, make your own distilled water!
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post #7 of 9
distilled is preferred, but many in Europe use deionized since in some places it is easier to get. If I were in Europe, I would just use deionized or RO is could find that, and often deionized is distilled water then passed through ion exchange resin, just depends.

But both distilled and deionized will pull metal ions from blocks, until a steady state concentration is reached, then the water is no longer deionized after a few weeks and no longer aggressive.

You shouldnt use distilled or deionized water that is continually fresh going through copper pipes as after years and millions of gallons the distilled or deionized will erode the pipe. But circulating the same water is perfectly fine, since, again, after a few weeks the water will no longer be deionized.
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post #8 of 9
I have tested both distilled and filtered tap water for long term tests of about a year and could not see any d difference really. But..tap water quality and hardness varies significantly from region and even per well in the same town so its not advisable to use tap because of that unknown. Also..I'm a cheap myself but a gallon of distilled around here is less than a buck, so I have a hard time wanting to save one dollar when it is flowing through hundreds of dollars worth of gear.
    
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post #9 of 9
De-mineralized water will have the same properties as de-ionized right? Or are they one and the same?
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