The aluminium ammonium sulphate market is valued at USD 605.5 million in 2025 and is projected to reach USD 879.2 million by 2035, growing at a CAGR of 3.8%. By application, water treatment will dominate the market with a 59.8% share in 2025. By product form, liquid aluminium ammonium sulphate will account for 45% of the market.