Just wanted to thank everyone in this community. I was having issues with my pool in June when I found this site. At the advice of many here, I ordered the TF100 test kit and stopped relying on my local pool store for testing. The difference has been night and day. I was going into the pool site once or twice a week and felt like every time I walked out I had spent $40-$60. Even worse, they had me put so much calcium that I started to get calcium flake in the pool. The first test with the TF100 indicated that CH was 875. I went back to the pool store to talk to them and they said that was impossible. Haven't been back there since. After several partial drains and rainwater refills I got things balanced properly. Now I test the basic pH and TCL every few days and do the full suite of TF100 tests on the weekend. The pool is perfect all the time and I've hardly spend any money on chemicals since 7/1 when I took control myself. This would not have been possible without this community and the great information that is shared on here. Just wanted to say thanks to the mods and all the active people who give great advice.