Dishwasher usage, especially in hard water conditions can cause the build-up of Limescale and decrease the overall effectiveness your dishwasher. To combat this, Finish Dishwasher salt performs 5 power actions that reduce water marks and Limescale build-up. Other salts also contain impurities like iron and carbonates that damage, rather than protect, your machine, while Finish dishwasher salt is 99.9% pure for maximum effect. It is also specially granulated to soften water to eliminate scale deposits on dishes and in the dishwasher. Finish is #1 recommended brand worldwide by leading dishwasher manufacturers Beko, Bosch, Neff, Samsung & Siemens.