Aluminum sulfate is a chemical compound with the formula Al2(SO4)3. It appears as a white crystalline solid and is commonly used in various industries, including water treatment, paper manufacturing, and food processing. In water treatment, it helps to clarify water by causing impurities to clump together, making them easier to remove. In addition to its industrial applications, aluminum sulfate is also used in gardening as a soil amendment. It can lower soil pH, making it more acidic, which is beneficial for growing certain plants like blueberries and azaleas.