Well I'm also quite confused. I just re-did the test, and it only took 2 drops to turn the violet color. And then it too 10 drops to make it blue, which means my CH is 500ppm. Hmmm.. The only difference is that the pump hasn't kicked on today, so the water has sat motionless in the pool for about 13 hours. Could that alter the tests in any way?

Is 500ppm a bad thing? My TA is 60.