Dishwashers do not need table salt, but they might require dishwasher salt, also known as water softener salt or regenerating salt. The confusion might arise because these are two different types of salt used for different purposes in the dishwasher.
Dishwasher Salt: Dishwasher salt is a specific type of salt designed to regenerate the ion exchange resin in the water softener of the dishwasher. The main purpose of using dishwasher salt is to prevent the build-up of limescale and mineral deposits in the dishwasher's heating element and on your dishes. It helps maintain the efficiency and longevity of the dishwasher and ensures better cleaning results.
Table Salt: Table salt is the type of salt typically used for cooking and seasoning food. It is not suitable for use in dishwashers because it doesn't serve the same purpose as dishwasher salt. Using table salt in the dishwasher could actually be harmful and cause damage to the appliance.
If your dishwasher has a light indicating that salt is needed, it means that the dishwasher's water softener requires replenishment. This is usually a separate compartment in the dishwasher where you should add the dishwasher salt. The dishwasher will then use this salt during the washing process to regenerate the water softener and ensure proper operation.
It's essential to follow the manufacturer's guidelines for your specific dishwasher model regarding the use of dishwasher salt. If you're unsure about how to add dishwasher salt or have any concerns, you can refer to the dishwasher's user manual or contact the manufacturer's customer support for assistance. Additionally, your carers should be able to help you with the correct procedure for adding dishwasher salt if needed.