HIGH PURITY: Water softener salt pellets boasts a typical purity level of 99.6%, ensuring excellent quality. NATURAL CREATION: Crafted through the power of sun, wind, and time, solar salt is formed naturally. CRYSTAL APPEARANCE: Salt pellets possess a natural white and opaque appearance. LOW INSOLUBLE CONTENT: This type of salt contains minimal insoluble elements, enhancing its effectiveness. WIDE APPLICATION: Recommended for all water softeners, water softener salt pellets is NSF Certified to NSF/ANSI/CAN 60 standards. Diamond Crystal Bright & Soft Water Softener Salt Pellets, 40 lb. These salt pellets are advertised as being produced using natural processes like sun, wind, and time. They claim to be about 99.6% pure and are intended for treating hard water. Hard water contains high levels of minerals like calcium and magnesium, which can cause scale buildup in pipes and appliances, reduce the effectiveness of soaps and detergents, and create other issues. Water softener salt pellets are commonly used in water softeners to replace the calcium and magnesium ions in hard water with sodium ions, helping to prevent scale buildup and improve the quality of the water. The use of water softener salt pellets is considered a more natural and environmentally friendly option compared to some other water softening methods that might involve chemicals. It's important to follow the manufacturer's instructions and guidelines for proper usage in your water softening system.