Whilst we recommend that all appliances fitted to mains water supplies (particularly commercial dishwashers and glass washers) are installed and fitted with a water softener, the extent on which you will rely on your water softener to protect equipment, the frequency at which you are required to regenerate your water softener and the size of water softener you require will largely depend on whether you live in a hard water area or not.
Hard water areas are areas of the country that are prone to lime scale, usually noticeable by a build-up of white stuff around taps and elements in kettles. Using the same principle, you may notice lime-scale damage inside your ware washer if your water softener is not working correctly. Damage will likely be visible as white marks inside the machine cabinet or build up around the tank element.
If you are not sure on whether you live in a hard water area, then consult the diagram below: