Potassium Chloride (KCl) is generally categorized into three main grades: Industrial Grade, Food/Pharmaceutical Grade, and Agricultural Grade (MOP). Industrial grade is typically used for oil drilling fluids and metal processing, requiring a purity of 99% or higher. Food grade must comply with FCC (Food Chemicals Codex) or USP/BP standards for use as a sodium substitute or mineral supplement. Agricultural grade, often referred to as Muriate of Potash, focuses on K2O content (usually 60-62%) and is available in white or red granular/powder forms depending on the extraction process.