| It's useful if the dishwasher has lights to warn you when the rinse aid or salt need topping up.
The most convenient are models that have these on the outside of the machine (or the rim of the door for built- in models).
Dishwashers need rinse aid to speed drying and prevent water marks, and dishwasher salt, to soften hard water. Without them, you could risk damaging the machine, but you don't need to use them each time.
When you install your dishwasher, you'll need to adjust the water hardness level setting depending on the hardness of the water in your area.
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