that is the thing about foggers, the salts try and build up. I also found that hydroton clay likes to build up on the disks as well. With the fogger that I have you just wipe the disks off with your finger at least once a week. Other then that they keep pretty clean most of the time. The other trick is to use low salt nutrients that are 100% water soluble. The salts don't tend to build as badly.

I finally added in my radiator. It lowered temps a few degrees but nothing fantastic. I'll have to take a picture of it as this was one of the few implementations that actually worked like I imagined. I am semi-actively cooling the radiator but I could do better. For now I am hoping the temps wont be an issue. They get to about 80 in the res but I know at the misters they have to be much cooler.