I have ordered my expensive test kit and hope to get my pool straightened out, I have been having fits this year.
It is an older 10,000 gallon, sand filtered, gunite pool and the chloroine just keeps disappearing. I went to the store and had my water tested. Threw $88 worth of chemicals in and the second day, it was all gone, and algae had started back. I am going to try the BBB method next when I get my test kit in the mail. -Blessings!