Originally Posted by popeye

Here is the deal with R/O water, I have one. R/O water is almost pure it will dissolve whatever minerals/chemicals it can at that temp/pressure.
Rainwater is relatively pure and it dissolves mountains. Tap water is full of stuff and as such is naturally buffered and is not going pickup more
pollutants at the same rate so using relatively clean water may just make things worse. Any chemists (not internet) in here?