The answer to 'why is my water softener overflowing' is that there are several common causes, including a stuck or malfunctioning valve, a clogged drain line, or an issue with the timer or control settings. This can lead to the brine tank continuously refilling and overflowing.
Some common symptoms of an overflowing water softener include water spilling out of the brine tank, a constantly running softener, and high water usage. To troubleshoot, first check the drain line for clogs and ensure the valve is operating properly. You may also need to adjust the timer or control settings. If the issue persists, it's best to call a professional plumber to diagnose and repair the problem.