An advanced septic system (sometimes called an engineered septic system) is a secondary treatment unit that removes wastewater contaminants before discharging treated effluent to your drain field, a ditch, or a watercourse.
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Oct 7, 2015 · There are a lot of hidden costs. Here you need a yearly inspection at $300 a pop. They use electricity to run pumps and aerators at another $200 ...