Premium solar water softener crystals are 99.7% pure salt with no additives. The crystals are safe and effective to use in all traditional water softener systems.The new 15 kg/33 lb bag is easier to carry and easier to load into any water softener unit. Extends the life of appliances and plumbing. Helps soaps and detergents clean more effectively. Helps keep clothes brighter snd whiter. Helps with healthier hair and skin for your family.