What is a Subsurface Sand-Filter?
A subsurface sand-filter consists of a bed of sand buried below the ground. Effluent is distributed onto the sand through distribution pipes laid above the sand in a bed of gravel. The sand naturally cleans the wastewater, and treated wastewater goes to a collection tile located in a bed of gravel located below the sand filter. The waste is then discharged off-lot through the tile. What is a Mound System? Whereas, a subsurface sand filter is located below ground, a mound system is located above ground. Mound systems can be used where the water table is high or the soil is too shallow or tight to provide adequate treatment. A dosing tank pumps the effluent to the mound where the effluent flows through a sand layer. After the wastewater flows through the sand layer, it enters the natural soil, which removes the remainder of the pathogens. There is no outlet tile for the system. Septic System Maintenance Information: How do I find my septic tank? If you do not know where your septic tank
