I changed the Culator today - figured it will be easier for me to remember to change at the first of the month, and it was close enough to the date that I first put the bag into the skimmer basket. As my title indicated, we were having a problem with green hair, and I suspected that copper was the problem. I was adding copper with the BioGuard Shock product. Also, we have some staining on our pool this summer, which I suspect is iron from our water supply. While we have city water, we have had drought conditions this year, and I think the water has a higher iron content because of it. Here are the pictures from the Culator:


While the color looks greenish, I think it is due to the copper plus iron in the water. There are areas in the packet that are more blue, and then some more yellow.


This shows a really blue area of the powder.


Another closer view with some yellow.

I think the Culator is really working in our pool. My daughter had really green hair at the end of June, and it has since turned back to her normal color. She swims nearly every day. My hair was also turning green, and though I don't swim daily, since using this plus the Kem-Tek, our hair is looking great. I really appreciate all of the help!