This system consists of a septic tank, constructed wetland, and land application system' The wetland

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This system consists of a septic tank,
constructed wetland, and land application system.
The wetland consists of a bed of graded stone
with water flowing just below the surface.
Vegetation that is adapted to saturated
conditions is grown in this bed, feeding on the
nutrients, organic matter, suspended solids, and
pathogens in the effluent. The bed is set in a
watertight basin lined with compacted native
clay, bentonite clay, concrete, PVC, or a similar
watertight substance. Although both hard- and
soft-tissue plants can be used in the system,
some experts prefer hard-tissue plants believing
they provide a pathway for oxygen to enter the
wetland during winter months and hard-tissue
plants reduce maintenance. However, many
homeowners prefer colorful, flowering,
soft-tissue plants.