What changes with softer water?
Less mineral buildup
Softening reduces the hardness minerals that form scale.
Less soap residue
Hard water reacts with soap; reducing hardness can reduce the film it leaves behind.
Fewer hardness-related spots
Softening can reduce mineral spotting, although it will not fix every cause of cloudy glassware.
The useful part of the science.
A conventional softener uses resin to remove calcium and magnesium, the main hardness minerals. Salt is used to regenerate that resin so it can keep working.
What a softener does not promise.
Softening is not a disinfectant, not a guarantee that water is safe, and not the same as treating every possible drinking-water concern.
Sources
- USGS hardness overview
- Minnesota Department of Health softening FAQ
- CDC home water treatment systems