What type of detergent should I use in my GE dishwasher?
Use only detergent specifically made for use in dishwashers, and Cascade® Automatic Dishwashing Detergent has been approved for use in all GE dishwashers. Keep your detergent fresh and dry, and avoid putting powder detergent into the dispenser until you're ready to wash dishes. The amount needed depends on water hardness—hard water requires extra detergent while soft water requires less. (Page 13)
From the official GE GHD1106 Dishwasher manual, page 13
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