The dishwasher impeller creates the necessary water pressure and movement required to effectively clean dishes. It is a rotating mechanism that is located at the bottom of the dishwasher, and it propels water from the bottom of the dishwasher up to the spray arms, which then distribute the water throughout the dishwasher. The dishwasher wash impeller is powered by the motor, and it is typically made of plastic or stainless steel to ensure durability and longevity. In some cases, it may be necessary to replace the impeller in a dishwasher. This is typically done if the impeller is damaged, worn out, or not functioning properly.