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Advanced domestic wastewater treatment tanks are used to remove solids, pathogens and other impurities to meet water quality requirements. The treated water (effluent) typically becomes surface water, but can also be reclaimed for domestic uses such as toilet flushing and irrigation, or returned to groundwater sources. Wastewater treatment tanks can be large commercial systems for treating community wastewater, or small tanks installed in households to treat domestic wastewater on site. Current advanced treatment systems are often an alternative to simple (and at times outdated) septic tanks. Advanced treatment tanks may contain different compartments (e.g. pre-treatment, primary, secondary, etc.), where the wastewater undergoes different forms of treatment, such as chemical, physical and biological, to separate contaminants from the water.