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Old November 18, 2008, 07:39 PM
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Default Deionized, demineralized, distilled -- which to get or avoid?

Okay, so I am under the impression that demineralized water is essentially the same distilled. Is that assumption correct? I ask because I have not been able to find distilled water at any store nearby, but they do have demineralized.

The other, more important issue, is deionized water. I went to Canadian Tire and all they had was deionized, so I grabbed a couple of jugs. Before I use them though, I am wondering if it's safe to use in a WC loop. Because the water is deionized, will it react adversely to the copper on my blocks? Will it cause corrosion? Is it even safe to use for cleaning my radiator?
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Old November 18, 2008, 07:56 PM
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Deionized water yields similar results as distilled water (to me they're the same)

I wouldn't trust demineralized, since the term is very vague, and could be bottled drinking water as far as I see it.
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Old November 18, 2008, 08:08 PM
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Don't get the deionized water from Canadian Tire. I almost bought one myself but then I read more carefully. It mention it added a agent in it and this is not a good thing.

Go to WalMart and check the drugstore section for distilled water. I bought a gallon jug for 3 bucks.
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Old November 18, 2008, 08:11 PM
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I'm worried that the water will attempt to reach equilibrium by going to work on my copper blocks and taking its precious ions. Distilled water is more balanced, so it should not be as bad. Another benefit of distilled is that virtually any organic life should be dead, so less cleanup in the long-term. Am I right about these? Edit: Ah, I see Xil's post now. Okay, off to Walmart in the morning.
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Old November 18, 2008, 08:23 PM
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Distilled with as little mineral content as possible. (Wallymart has several brands, one of which has a very high mineral content).
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Old November 18, 2008, 09:16 PM
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I usually go to the local safeway to get some DI water.

Copper has a very low rate of ionization unless involved within a redox reaction.
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Old November 19, 2008, 06:02 AM
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Only use distilled.
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Old November 19, 2008, 06:11 AM
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Quote:
Originally Posted by zlojack View Post
Only use distilled.
seconded. Shoppers Drug Mart, Walmart, pretty much everywhere around here has it. 4L for $1
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Old November 19, 2008, 06:29 AM
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In theory, deionized water could help act as an anti-corrosive. Unfortunately, in a situation that would normally lead to corrosion, the water will re-ionize rather quickly, and stop protecting anything. Aside from that, deionized isn't necessarily a guarantee that the water is free of non-mineral/ion content. So distilled is the way to go. Dirt cheap too.
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Old November 19, 2008, 08:52 AM
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Use distilled
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