Is rinse aid necessary for this dishwasher?
Yes, rinse aid is necessary for good drying results. This dishwasher is designed to be used with rinse aid for good drying performance and to control the buildup of hard water deposits. Energy efficient dishwashers use less water and energy, so they depend on the water sheeting action of rinse aid for good drying performance.
From the official Kenmore 66513262K111 Built-In Dishwasher manual, page 25
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