This is a two-pound bag of soft spring dishwasher salt. This salt is used to soften water in order to enhance the performance of your dishwasher, prevent limescale, and ensure your dishes are not left with spots or watermarks on them. This salt is intended for use in dishwashers that have a softening unit. Make sure you frequently check the salt level, and refill as required. Optimal incoming water temperature is 120 degrees Fahrenheit.