Sodium bisulfate, also known as sodium hydrogen sulfate, is a white crystalline powder that is commonly used as a pH adjuster in various applications. It is often found in swimming pools, where it helps to lower the pH of the water, making it more comfortable for swimmers and preventing corrosion of pool equipment. In addition to its use in pools, sodium bisulfate is also utilized in the food industry as a food preservative and in cleaning products for its ability to remove stains and mineral deposits. It is important to handle sodium bisulfate with care, as it can be irritating to the skin and eyes.