Merry Lea made a commitment that the water that leaves the Rieth Village
site would be as close as possible to the quality it was when it entered
the site. All wastewater, after passing through a settling septic tank,
runs through a submerged bed constructed wetland where bacteria feed on the
nutrients and slowly break down toxins. The treatment process continues in
a recirculating sand filter where the water percolates through a bed of sand
up to six times before leaving the site.