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DOMESTIC SEWAGE TREATMENT septic tank and soak pit - PowerPoint PPT Presentation


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Why Do We Need a Sewer System? . Each time we flush the toilet or wash sth down the sink\'s drain,we create sewage (also known in polite society as wastewater). One question that many people might ask is, \"Why not simply dump this wastewater onto the ground outside the house, or into a nearby stre

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