How much rinse aid does the dispenser hold, and how long does it last?
The rinse aid dispenser holds 5 oz (150 mL) of liquid rinse aid. Under normal conditions, this amount will last approximately 1 to 3 months. When the rinse aid indicator drops to the 'Add' level, it is time to refill the dispenser.
From the official Whirlpool W10021620 Built-In Dishwasher manual, page 12
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