I usually add to 5.2 stabilizer to my mash tun ( I have well water and have to use 5.2 pH stabilizer), but this time I added it to the aluminum pot that was heating up the sparge water(I treat ALL my brewing water with 5.2 stabilier, even the sparge water). The water in the pot took on a kind of green tint (copper?) and got a slight greenish film on top the water. I was in a hurry and used it anyway, and of course, my final product has a weird kind of light greenish tint to it.. I ended up throwing away the whole 5 gallon batch, but I am curious if anyone else has ever heard of this? How reactive is aluminum? I would list the "salts" that are in the pH 5.2 stabilizer, but they are proprietary..