Thanks for the reply (and the welcome!) Watermom. That makes sense. I wanted to make sure I wasn't missing something obvious in my calculations.

I've had this pool for 10 years. I just discovered this site and have learned much about pool chemistry and feel I finally know why I have had all the issues (mostly algae blooms) I have experienced. I threw away my test strips and am using a Taylor 2006C test kit. I have a plaster 30,000 gallon pool.