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This article explains exactly how septic tanks work.
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A sewerage drain field and a septic tank make up a small scale sewage treatment system. A septic tank is basically a rectangular shaped underground receptacle for wastewater. It is watertight, made of concrete, and consists of tanks that are divided into chambers. The first chamber has twice the volume as the second and the majority of the organic solid matter, referred to as sludge, gets settled here. The second chamber further purifies the wastewater.