•. Sulfuric Acid (H₂SO₄): One of the most common acids used to lower pH in water and wastewater treatment. It is cost-effective and widely available.
• Hydrochloric Acid (HCl): Used to lower pH in specific applications, particularly where chloride is not a contaminant concern.
• Carbon Dioxide (CO₂) for pH Control: CO₂ dissolves in water to form carbonic acid, which can lower pH without adding excess mineral content. It is commonly used in potable water systems and certain industrial processes.