What is the purpose of cotton in water filtration?

Cotton is used in water filtration primarily as a pre-filtering agent. It effectively captures larger particles, sediments, and debris from water, thereby improving the clarity and quality of the water before it passes through more advanced filtration systems. Additionally, cotton's fibrous structure allows for good water flow while maintaining a level of filtration efficiency. This makes it a cost-effective and biodegradable option in various water treatment applications.