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The other spot I'd be in trouble with is the tankless Rinnai heater and the hydronic heat exchanger for the forced air heater connected to it. All copper piping..

What about using ceramic filter...

I never thought about the copper pipes which is the old part of our house. The new addition upstairs is Pex. It's quite ironic how the RO water gets mad and wants it's metal and minerals back.:D
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They use wet paint booths with a wall of water falling into the paint fume flow. Should be fairly simple to design.

http://www.vitechindia.org/paint-booths.html

After some internet research the white spots are evidently from the silica and not alkaline. Our under sink RO removes the silica to the point of not leaving any white scum in the bottom of a pan...

Here's a link to a report from our water district for 2009. There is a Silica test report showing 32-39 Mg/L..
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Thanks for the reply Akpsdvan. Our alkalinity is off the chart on our water test kit above 300mg/L. It leaves white spotting on everything it touches like shower glass and on the car if you wash it. ...

Our water is nearly off the scale in alkalinity at 250+. The water is only moderately hard. Would a water softener help much?

We use an RO for drinking but a whole house RO is expensive and...