Actually, I've used water wetter before to great effect. I never noticed any foaming or gunk/goop anywhere. But then again I wasn't using clear tubing, nor am I here. I am using Norprene industrial chemical type tubing. Materials that will be in my water loop: Norprene, PVC, Copper, Nickel, Brass, Galvanized Steel, and acrylic. The Galvanized Steel only touches PVC (so there is no galvanic corrosion there) and the only aluminum is touching the copper in the sub-zero chilling unit which I may remove from the copper tubes.
You shouldn't need to go as high as 20-25 C, 15 C can take you up to pretty high levels of humidity and still be safe. (About 20 C room temperature at 75% relative humidity). I really never let my house go above 50% relative humidity and 20 C temp, so I could run chilled water as low as 10 C. That would be my limit for the Geothermal Loop but the temperature I am expecting is 13-14 C which is well within the safety limit. Much better water temps than ambient cooling that is for sure!
On another note; I just finished my custom reinforced 7 foot stainless steel desk to hold my monster display setup. I stood on this right in the middle on one of my feet (180lb) and it didn't even flex a hair.
Welding stainless steel is harder than you think! (just kidding). Time for the old glass desk to go!
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