The answer to 'my water softener smells bad' is that a foul odor coming from your water softener is usually caused by bacterial growth or a buildup of organic matter. This can happen if the softener is not properly maintained or if the brine tank becomes contaminated.
Common symptoms include a rotten egg or sewage-like smell coming from the water softener or plumbing fixtures. This is not only unpleasant but can also indicate a potential health hazard. The good news is that there are several steps you can take to address the problem, either through DIY troubleshooting or by calling in a professional plumber.