Biological filtration is a process that has been proven to reduce the number of pollutants in water. This technique involves promoting the growth of beneficial microorganisms, such as bacteria and fungi, which can break down organic compounds, volatile organic compounds (VOCs), biochemical oxygen demand (BOD), chemical oxygen demand (COD), and suspended solids into harmless components. This method of wastewater treatment requires careful monitoring and control in order for it to be done correctly, but when done properly, it can provide an effective way to reduce pollutants from water. Biological filtration is a highly efficient method for water purification, as it uses natural processes to break down impurities and contaminants into simpler components. Through biodegradation, complex molecules in water are broken down into smaller ones, reducing their toxicity and improving the oxygenation of the liquid. Additionally, this process also helps to remediate putrefaction compounds in water, eliminating odors and improving its overall quality.