I just wanted to say a quick thank you to the creators and contributors of this site. I'm making real, noticeable progress on my pool thanks to this site. Using the TF-100 test kit I'm getting predictable results on each sample test. You all know how reassuring and comforting predictable test results are. I still need to keep the shock level up but my CC level dropped below .5 today. Can't thank TFP enough!