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<p>[QUOTE=&quot;dougsmit, post: 1895734, member: 19463&quot;]I have a feeling that we have a terminology problem here.&nbsp; In the US &#039;distilled&#039; water of the lowest grade but that works for coins is 89 cents a gallon at groceries including Wal-Mart.&nbsp; It was once intended for use in steam irons but now you see irons labeled that it is not required.&nbsp; On the shelf next to it is drinking water marked differently.&nbsp; On the label, the distilled is said to be &#039;processed by steam distillation&#039;.&nbsp; I am sure that more expensive distilled waters might have less residual mineral mater but we do not need reagent grade chemicals here for quantitative experiments.&nbsp; The idea is that water without minerals will remove minerals from the surfaces of the coins faster than tap water which is already full of minerals.&nbsp;&nbsp; I believe that more frequent changes of lower grade water would offset any advantage of more expensive &#039;double distilled&#039; water which would start with regular distilled water and distill it again.&nbsp; </p><p><a href="http://www.walmart.com/ip/Great-Value-Distilled-Water-1-Gal/10315382#ProductDetail" target="_blank" class="externalLink ProxyLink" data-proxy-href="http://www.walmart.com/ip/Great-Value-Distilled-Water-1-Gal/10315382#ProductDetail" rel="nofollow">http://www.walmart.com/ip/Great-Value-Distilled-Water-1-Gal/10315382#ProductDetail</a></p><p>I was brought up to believe that distilled water was not as healthy to drink as hard well water but that was a long time ago and I have no idea about current thinking on the matter.[/QUOTE]</p><p><br /></p>

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