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Beg to differ with you Ray. Most of the "premix" or "full strength" anti-freezes are NOT "made with distilled water". 99% of these are simply "reclaimed", "recycled", "recovered" or "re-processed" product.... used coolant is drained from vehicles in garages or fleet shops and is collected by "anti-freeze recyclers". Most of these places only filter the solids and petroleum contaminents from it and blend it to a mix that gives freeze protection to around -30F. Some process it in different ways to make it more eye applealing as in it looks more like new production with the rich green color. I don't know of any that claim to remove all contaminents including the water born minerals that came in with the used stuff. I'm not trying to pick a fight with you here. The trade name escapes me right now but the only one I know of that is sold as pre-mix and certified free from mineral/metal contamination and is PH balanced was selling for around $30/gallon buying it in 55 gal. drums several years ago. We had to use this coolant in a closed loop system for a plastics molding machine to maintain a constant mold temp, corrosion and contamination could not be tolerated. This may have changed since and I won't dispute it has. One thing I would caution is to get the mfg to provide a certificate with the product, if they can't give you current test data from a thrid party lab, chances are they are BS'ing you as the quality/purity of the product. If you really want to get picky here, you really don't know how clean that distilled water you get at the auto store really is do you? Big time battle on another discussion board a few months ago was between distilling and demineralizing water. According to what I understand, unless water is distilled in a climate controlled atmosphere as in 100% inert gas, the condensed water can collect contaminents from the air while it's in the vapor state. Along with this it can get contaminated from the condenser plates and everything else it touches along the way including the plastic container it's sold in. Argument went on the side of demineralized water since this is done either by ion exchange or eletrolysis in a closed or semi-closed system. All agreed that water purified in either manner should only be shipped in non-leaching containers. I suppose this gets a little extreme for engine coolant purposes but I hope you see the point I am making, make sure you are getting what you pay for.
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