What is the most common type of media used in drainfields?

The most common type of media used in drainfields is clean gravel. This material is widely utilized due to its excellent drainage properties. Clean gravel allows for the efficient passage of treated effluent from the septic system while providing adequate aeration and preventing clogging.

The size and permeability of clean gravel facilitate the movement of water away from the drainfield, promoting optimal treatment of wastewater as it percolates through the surrounding soil layers. By maintaining proper moisture levels and supporting the biological processes that break down organic material, clean gravel plays a crucial role in ensuring the effectiveness and longevity of the on-site sewage facility.

In contrast, sand and soil can have varying degrees of drainage capacity, which might not be as effective as clean gravel for certain applications, while aggregate, depending on its composition, may not offer the same level of efficiency in drainage and filtration as clean gravel does.