If you plan on building a house in an area that isn't connected to the municipal sewage treatment plant, then installing a septic tank as part of your overall septic system is inevitable.
The tank will hold all the grey water and black water exiting your house from separate units long enough for friendly bacteria to break down the solid waste, forming sludge at the bottom of the tank. The lighter-than-water waste, such as oil, fat, and grease float to the top as scum, while the liquids that leave the tank to be discharged into the drain field are called the effluent.
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