Potassium chloride (KCl, or potassium salt) is a metal halide salt composed of potassium and chlorine. It is odorless and has a white or colorless vitreous crystal appearance. The solid dissolves readily in water, and its solutions have a salt-like taste. Potassium chloride can be obtained from ancient dried lake deposits. KCl is used as a salt substitute for table salt (NaCl), a fertilizer, as a medication, in scientific applications, in domestic water softeners (as a substitute for sodium chloride salt), as a feedstock, and in food processing, where it may be known as E number additive E508.Potassium chloride 99.5% AR is a high-purity form of potassium chloride (KCl) with at least 99.5% of the substance, suitable for analytical or research (AR) applications. It is a white, crystalline solid used as a potassium supplement, a component in fertilizers, and a reagent in various scientific processes, such as preparing buffer solutions.