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Caustic soda, or sodium hydroxide (NaOH), is a versatile chemical in industrial processes. One of its critical applications is in wastewater purification. Wastewater treatment is a significant part of environmental protection. It involves removing contaminants from industrial or municipal water to make it safe for discharge or reuse. Caustic soda plays a crucial role in balancing pH levels, neutralizing acids, and removing heavy metals from wastewater.