The answer to 'water softener overflowing' is that a water softener can overflow for several common reasons, such as a stuck float valve, clogged drain line, or excessive water usage. Symptoms may include water spilling out of the softener, the tank continuously refilling, or the system running excessively.
Some potential solutions include checking and cleaning the float valve, unclogging the drain line, and ensuring the softener is properly sized for your home's water usage. If the issue persists, it's best to call a professional plumber to diagnose and fix the problem, as they have the expertise to properly repair or replace the water softener.