Step-by-step explanation:
Leaching fields or leach drains are subsurface wastewater disposal facilities used to remove contaminants and impurities from the liquid that emerges after anaerobic digestion in a septic tank.
Dosing schedules
A drain field may be designed to offer several separate disposal areas for effluent from a single septic tank.
Removing Inappropriate wastes
Septic tank and drain field microorganisms have very limited capability for catabolizing petroleum products and chlorinated solvents, and cannot remove dissolved metals, although some may be absorbed into septic tank sludge or drain field soils, and concentrations may be diluted by other groundwater in the vicinity of the drain field.