Sodium bisulfate, also known as sodium hydrogen sulfate, is a white crystalline powder with the chemical formula NaHSO4. It is commonly used as a pH adjuster in swimming pools and as a cleaning agent in various industrial applications. Sodium bisulfate is soluble in water and releases sulfuric acid when dissolved, making it useful for lowering pH levels. In addition to its use in pools, sodium bisulfate is employed in food processing as a food preservative and in the textile industry for dyeing processes. It is considered a safer alternative to stronger acids, making it a popular choice for both commercial and household use.