Dishwasher water-softener salt products go into the water-softening unit of the dishwasher and remove the calcium and magnesium ions of hard water, leaving dishes cleaner. Without the use of dishwasher water-softener salt products, harmful scale deposits can appear on dishes and the dishwasher's interior.
Dishwasher water-softener salt products also reduce soap scum. The salt granules are larger than those of table salt, ensuring that the salt dissolves slowly and doesn't clog the water-softening unit of the machine. Consumers in areas with hard water find that the salt helps keep their dishes cleaner and their dishwashers functioning longer. Some companies offer pure boiled salt while others add a clump-preventing agent to the mixture.