This document provides a material safety data sheet for caustic soda, which is a strong base used as a pH and alkalinity controller. It lists caustic soda (sodium hydroxide) as the main hazardous ingredient. Contact with caustic soda can cause severe burns to skin, eyes, and respiratory system. If exposed, immediately flush with water and seek medical attention. It should be stored separately from acids and in a dry, cool place. Personal protective equipment like gloves, eye protection, and dust masks are recommended when handling. Caustic soda is soluble in water and may damage aquatic environments if released into drains or groundwater.