 It was small particles of copper. There were some electroses going on, and pinhole leaks in aluminum started occurring. But then every part of the country started having a problem, and that's kind of where we are now. It started out with an oxygenated bleach solution, and now different products that I wouldn't forget is the easiest one to use. I guarantee it. Never found anything to be easier. All right, let's go to Bob. Bob, welcome. Thank you.