How do I fill the rinse agent dispenser?
Unscrew the cap and add liquid rinse agent until it just reaches the FULL line on the tip of the cap. Replace the cap. The dispenser automatically releases the rinse agent into the final rinse water. The container holds 4.8 ounces and should last about 3 months. Do not overfill.
From the official GE GSD1120 Dishwasher manual, page 6
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