Dishes must be washed with soft water. Finish Dishwasher Salt helps in making hard water soft in your dishwasher - no more white spots on your dishes. It helps avoid scale deposits on the dishes and in the dishwasher. Finish Dishwasher Salt effectively softens your water to boost the cleaning performance of your detergent by preventing spots and watermarks on your dishes. Finish Dishwasher Salt is guaranteed free from residues. Its purity ensures that your dishwasher's built-in water softening unit works effectively. Other salts may contain impurities like iron and carbonates which could damage the water softening unit. *Finish is recommended by more dishwasher manufacturers than any other detergent.