Czech term (edited): agresivn�j�� a �hladov�j�� ne� voda

Really pure deionized water, on the other hand, is highly agressive as a solvent, and will quickly cause corrosion in things like pipes, vessels, and containers. What that means, among other things, is that even quite inert containers for d.i. will over time contaminate the water.
Distilled water is not nearly as agressive as deionized, and it is essentially balanced. It still has very little ions in it, but it is less aggressive than DI and while I would not recommend drinking it either, is less likely to harm you. It also is not corrosive to most metallic internal parts on your welder.

See also Source and Cause of Corrosion
Source and Cause of Corrosion


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Note added at 3 hrs 36 mins (2004-03-14 18:23:43 GMT)
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(is) \"highly aggresive\" and \"highly corrosive\" in comparison with
another link
http://wilkes.edu/~eqc/corrosion.htm

Boiler water treatment: "Condensate from the condenser is very pure and slightly acidic, often referred to as 'hungry water'. It can dissolve metals in trace amounts to satisfy this hunger."
Water Pipe Corrosion : "Aggressive water is drinking water that can cause corrosion.... Not only do these individuals treat water to make it safe to drink, they sometimes alter the water chemistry to make it less aggressive. Some municipal water works add corrosion inhibitors to the water."

Czech term (edited): agresivn�j�� a �hladov�j�� ne� voda

instead of just "disolving", you can use "prone to disolving" I suppose.