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[Stige]

distilled water has no minerals to clog the system and change the propeties, no good putting high chalk or iron content into the cooling system

I used to use distilled water when Dad could bring home gallons of it from work. Since he retired, I just use tap water. And I live on the North Downs, so the water is hard as nails and full of all sorts of deposits. This has no discernible affect on any of the cooling systems I've poured it into, so I see no need to worry about it.

This.

Also if you can drink it, I dont see any possible harm in using it with the coolant. Tap water in Finlanid is fine atleast, even use it in my computer.

[ajsphead]

Read somewhere that you can melt the ice out of the freezer and it's as good as distilled water. Don't know if that's true or not.

[frostbite]

Just another note, de ionized water is non conductive so there is no chance of electrolysis plating the ally head

[Bigron]

Fridge melidioter is not CHEMICALLY clean, ajsphead, because your fridge and its surroundings are not sterile, but it's as near to sistilled as doesn't matter - and it's free! 

Ron.

[aaronjb]

Fridge melidioter is not CHEMICALLY clean, ajsphead, because your fridge and its surroundings are not sterile, but it's as near to sistilled as doesn't matter - and it's free! 

  the swear filter strikes again!

[Bigron]

What is swearing about "melidioter"? melt water/  m-e-l-t   w-a-t-e-r? 

Ron.

[Bigron]

It did it AGAIN! What's the rude word that I don't know about?

Ron.

[aaronjb]

Take the 't' of melt and the 'wat' of water and put them together and what have you got? Something to annoy the swear filter with..

[terry paget]

I used Halfords red stuff after changing the head gasket on daughter in law's Rover Streetwise. I came to the conclusion later that Gm Dex Cool is OAT (organic acid) too, and that I buy in 20 litre bottles trade club, making it much cheaper. The colour is added dye.

Melted fridge ice cubes contain the same impurities as the water they are made from. The ice on the interior of our deep freeze is frozen air moisture and is as pure as distilled water.

Mains tap water is excellent stuff in Somerset, comes from reservoirs filled by rain water. contains traces of calcium from the local limestone rocks. Only reason tap water tastes a bit odd is when it has been through 7 people before it arrives, like London Thames water. Chlorination kills the bugs and makes it safe to drink, but cannot remove everything.

 A survey years ago comparing bottled spring water with mains water found that mains water was nearly always the purer and safer.

I have always used mains water (plus antifreeze) as coolant.

[TheBoy]

Freezing tap water does nothing to its make-up once defrosted again.  You need heat to distill it to get it near pure.

That said, tap water normally suffices, though when I was in Aylesbury, I used the deionised stuff if bikes/batteries etc.  Given its low cost, if I needed to top up a battery, I'd still use de-ionised....