Re: anti freeze
Water: Deionised is the name of the process, it doesn't (read: can't) just remove positive ions, it removes ionic materials which is basically all the things that cause scale, and any salt. The things in water that cause corrosion are, except for a tiny bit of organic acid perhaps, ionic i.e. minerals. Purified is a bit vague but it'll be deionised, distilled or RO (reverse osmosis) water, RO being the "best" but any of these will be good enough. Softened means the "hard" water metals of calcium, magnesium etc. are replaced with sodium, so you don't get any scaling of pipes/kettles but no change in ionic strength and it will corrode things more than one of the purified types of water. Water from a dehumidifier or condensing tumble drier is essentially distilled water, but might have a bit of fluff in it.
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