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<p>[QUOTE=&quot;Vess1, post: 3442671, member: 13650&quot;]This is very interesting.&nbsp;&nbsp; I wonder if distilled water is similar to reverse osmosis produced water.&nbsp;&nbsp; </p><p>&nbsp; Basically unfiltered tap water is full of all kinds of stuff.&nbsp; Tap water is pretty much already saturated with different things and isn&#039;t desperate to strip anymore molecules into itself.&nbsp;&nbsp; There&#039;s dissolved rock in it.&nbsp; The city chlorinates it to kill bacteria.&nbsp;&nbsp; They often add calcium and fluoride to it.&nbsp; There may be dissolved lead in it.&nbsp; Dissolved meds.&nbsp; They add phosphates to keep the pipes clean.&nbsp; Copper.&nbsp; Some towns have problems with arsnic in it.&nbsp; Well water has nitrates in it.&nbsp; &nbsp; Straight out of the tap you drink all that.&nbsp; </p><p>&nbsp;&nbsp; Depending on your location and city vs. country the total of all these dissolved solids vary greatly from location to location.&nbsp;&nbsp; Here the TDS out of the tap is about 280 ppm.&nbsp;&nbsp; That&#039;s the total of everything in it.&nbsp; There&#039;s no way to break it down individually without sending off for analysis.&nbsp; Based on the color of my sediment filter after a year I&#039;d say a lot of it is dissolved rock and rust.&nbsp; The water comes out very clear but it&#039;s not clean.</p><p><br /></p><p>&nbsp;&nbsp;&nbsp; The next city over might be at 400+.&nbsp;&nbsp; The higher the TDS the harder it is for your body to process it to hydrate you.&nbsp; Some towns in the southwest are at 600+&nbsp; It can get pretty high.&nbsp;&nbsp; The EPA does not recommend drinking anything over 600 TDS.&nbsp; </p><p>&nbsp;&nbsp; So basically yeah, tap water is dirty and this is why it leaves spots and can&#039;t be used alone to clean off a coin.</p><p><br /></p><p>&nbsp; An RO unit (1950s technology) strips it down to about 10 TDS.&nbsp; If you add a DI resin it can clean it up to 0 TDS.&nbsp; Which is close to what distilled water will be I suppose.&nbsp;&nbsp; When you get down to pure hydrogen and oxygen molecules it becomes reactive/corrosive.&nbsp; Pure water wants to strip the molecules out of metal and will rust stuff.&nbsp; &nbsp; Somebody more intelligent than me would have to explain why this happens.&nbsp;&nbsp; But this is why you&#039;d want to rinse with RO or distilled to leave for an air dry.&nbsp; There&#039;s technically nothing left in it to deposit as residue once it air dries.</p><p><br /></p><p>&nbsp; Only reason I&#039;m aware of this is I used to keep a reef tank.&nbsp; I currently keep an RO unit for drinking and cooking water.&nbsp; Would never be without one again.&nbsp; Occasionally use it for clean rinses on things.&nbsp; Haven&#039;t tried using it on a coin.[/QUOTE]</p><p><br /></p>

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