No, a dishwasher does not always need salt to run, but whether it's needed depends entirely on how hard your water is.
Water Hardness Dictates the Need for Dishwasher Salt
The primary reason for using dishwasher salt is to combat hard water. Hard water contains high levels of minerals, mainly calcium and magnesium. Over time, these minerals can build up inside your dishwasher, forming limescale, which can reduce the appliance's efficiency and lifespan.
Based on water hardness:
- Hard Water: If your area has hard water, your dishwasher needs dishwasher salt to clean as best as possible and prevent damage from limescale buildup. The salt helps regenerate the water softening unit built into many dishwashers, which removes these minerals from the water used during the wash cycle.
- Moderately Soft/Slightly Hard Water: For water in this range, all-in-one tabs are typically enough. These detergent tablets often contain water softening agents that can handle a moderate mineral load.
- Soft Water: If you have soft water, adding dishwasher salt is not necessary. Soft water already has very low mineral content, so limescale buildup is not a concern, and the salt would provide no benefit.
Understanding Dishwasher Salt and Limescale
Dishwasher salt is different from table salt. It is a pure sodium chloride in larger granules, designed specifically for the water softening unit in dishwashers. Using regular table salt can damage the unit due to additives and smaller size.
Limescale accumulation can:
- Reduce cleaning performance, leaving spots and film on dishes.
- Block spray arms and filters.
- Damage heating elements and other internal components.
Therefore, if you have hard water, using the correct dishwasher salt is crucial for optimal performance and longevity of your appliance. Consult your dishwasher manual or local water provider to determine your water hardness.
| Water Hardness Level | Is Dishwasher Salt Needed? | Typical Cleaning Solution |
|---|---|---|
| Hard Water | Yes (Essential) | Dishwasher Salt + Standard Detergent |
| Moderately Soft/Slightly Hard | Generally No (Optional for extra protection) | All-in-one Detergent Tabs (Usually Sufficient) |
| Soft Water | No (Not Necessary) | Standard Detergent or All-in-one Tabs |
