Potassium chloride, which is unlike salt or sodium chloride, is used in the brine tank for backwash. Potassium is an essential nutrient in human health, and is found in foods. Fruits and vegetables are some of the major sources of potassium. This product is also better for the environment because potassium actually contributes to healthy plant life and reduces the amount of chlorides discharged into ground water. This product can be used in all water softeners and can be poured on top of the existing salt in the brine tank. Most water softeners will not require any adjustments.