Limescale deposits caused by hard water can quickly reduce your dishwasher's efficiency. Finish dishwasher salt is over 99% pure and specially granulated for use in dishwashers. Its purity ensures your dishwasher's water softener works effectively, protecting the appliance from limescale while preventing water spots and marks* on your dishes and glassware. For spotless results, use 4kg Finish salt and rinse aid alongside your detergent.