What's in the AC condensation? Strange reaction with my concrete garage floor.

Title says it all. I'm getting some "oxidation" from the AC drainage on my garage floor. The white substance is after it drys the darker is where it recently dripped. Seems odd, any thoughts, our other cars don't do this. Tacoma has just over 500 miles. Thanks!

 

Pour some tap water on the floor a few feet away and compare. Get back to me with the results.

 

Made a tap water circle around the stain last night. No reaction, the water at the top just hasn't dried yet.

 

Condensate had a pH of slightly less than 7 because of contact with the air.

The concrete is getting acidized.

 

So my very old concrete floor is doing something, but the truck is ok, Right?!

 

That water has dripped off of some aluminum fins and mixed with whatever assembly chemicals are on the frame. Don’t drink it. Don’t worry about it.

 

I just about died laughing at that

 

I’m big on water conservation but even I draw the line. We harvest rainwater and grey water in three 1320 gallon buried water barrels. Grey water is from showers (we use natural soap) and that mixes with rainwater (second barrel) in the third barrel where it is filtered and tested before running through our irrigation. But I would never drink it...

 

Park in the same spot, keep a bowl there, water a tree.

 

https://www.reddit.com/r/askscience/comments/476fwk/why_do_air_conditioners_make_the_waste_water/

 

Hmmm? I don't see crystals in those white spots. Those spots looks more like a water based paint. I also think I see a little motor oil? I was thinking the residue came from the minerals in the concrete, however, I am not certain now. The tap water is probably a different PH as mentioned but I was just checking...