Why is the pH higher with the disk than with chlorine?
Chlorine requires you to keep the water’s pH between 7.2 and 7.6 because that is where chlorine performs best. The disk creates its own best operating level, usually between 7.6 and 8.2. Don’t try to lower the pH with chemicals because these will severely reduce the disk’s efficiency. After the disk is installed, test the pool or spa water for pH for a few days to determine a baseline pH. This baseline pH will help in determining when the disk needs to be replaced.
