Garbage disposal running but not grinding food well

Symptoms

• Disposal runs but food passes through mostly whole
• Takes much longer than it used to for scraps to disappear
• No jamming, just weak grinding
• Unit is old or heavily used

Likely causes

• CommonWorn impeller blades or grind ringThese lugs wear down and lose their grinding edge with years of use.
• CommonOverloading with too much food at onceFeeding large amounts at once overwhelms even a healthy disposal.
• PossibleInsufficient water flow while grindingWater helps carry ground waste through; too little leaves food circling instead of clearing.
• PossibleUnderpowered disposal for household needsEntry-level 1/3 HP units struggle with fibrous or hard scraps.

What to do

1. Feed food in smaller amounts with a strong stream of cold water running the whole time.
2. Cut tougher scraps like corn cobs, fruit pits, and bones into smaller pieces or avoid grinding them at all.
3. Run ice cubes through the disposal periodically to help scour the grinding surfaces.
4. Check whether the flywheel spins freely and evenly using the hex wrench with power off.
5. If performance has clearly declined over time with no jams, the grind components are likely worn and won't be restored by cleaning.
6. Compare the cost of a repair (rarely offered for these units) to replacing with a similar or higher horsepower model.

Tools and parts

• 1/4-inch hex wrench
• Ice cubes

When to call a pro

If the unit is several years old and grinding has clearly declined, replacement is usually more practical than repair.

Safety