How a dishwasher actually cleans your dishes

Understanding the Cycles of a Dishwasher | Ask This Old House · 4:06 · Video: This Old House · Watch at the source

In short: Plumbing expert Richard Trethewey demonstrates the internal mechanics of a dishwasher, explaining how water, heat, and pumps work together through various cycles to sanitize your kitchenware.

The process begins with a discharge pump removing any leftover liquid. Hot water then enters from the side to fill a bottom reservoir until a float is activated. In certain cycles, an electrical element heats the water to sanitize the dishes.

Once the reservoir is full, a pump sprays a mixture of water and soap over the dishes. The cycle concludes when the pump discharges the water out through the drain.

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