What does 'biofilter' refer to in septic systems?

A 'biofilter' in septic systems refers to a device that utilizes microorganisms to treat effluent before it enters the drain field. This process is essential for reducing contaminants in the wastewater, ultimately making it safer for the environment. The microorganisms break down organic matter and other pollutants found in the effluent, facilitating a more efficient treatment process.

By effectively managing and treating the wastewater through biological processes, biofilters help to protect groundwater and surface water sources from contamination, which is paramount in maintaining public health and environmental quality. This biological treatment technology is an important aspect of advanced septic systems and is particularly useful in areas where traditional septic systems may not function adequately due to soil conditions or high water tables.

In contrast, options referring to sand filters, chemical treatments, or gravel layers address different aspects of a septic system but do not specifically characterize the microbial function central to a biofilter's role in wastewater treatment.