The primary function of a drain pump in appliances like washing machines and dishwashers is to expel dirty wash water and rinse water out of the internal tub and push it up and through the household drainage plumbing system. During a wash cycle, the pump remains idle while water fills and agitates; once the cycle reaches the extraction or draining phase, the pump motor activates, spinning its internal impeller blades to suck wastewater from the tub and force it outward through the flexible discharge hose into your home's standpipe or laundry sink, completing the water cycle.
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