define septic tank.
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A septic tank is an underground chamber made of concrete, fiberglass, or plastic through which domestic wastewater flows for basic treatment. Settling and anaerobic processes reduce solids and organics, but the treatment efficiency is only moderate. Septic tank systems are a type of simple onsite sewage facility.
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a tank, typically underground, in which sewage is collected and allowed to decompose through bacterial activity before draining by means of a soakaway.
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