The design of the septic drain field is determined by the size of the dwelling that it serves and the soil conditions. The soil conditions would be tested by a method called a percolation test or perc test.
The absorption field is a subsurface leaching area within the soil that receives the liquid effluent from the distribution device and distributes it over a specified area where it is allowed to seep into the soil.
The filtering action of the soil, combined with further bacterial action, removes disease organisms and treats the harmful material in the effluent, completing the treatment process so that the water is recycled to the surface or groundwater source.
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