The septic system installation started today. In place of a drain field or evaporation mound, we have these 3 partly submerged concrete tanks which are lined with a waterproof membrane, filled with a layer of drain rock, a layer of pea gravel and fnally topped with sand - essentially constructed wetlands. When it's done, the sand will cover the tanks completely - they'll look like small pyramids with the tops cut off and overgrown with vegetation. (These are not what most people usually think of as "the septic tank" - those are next and actually consist of 2 more concrete tanks in the ground next to the house. This is a Glendon biofilter - simpler, better and less expensive than the alternatives - particularly given our soil conditions.)
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