Garbage disposal blades feel dull and won't cut well

Symptoms

• Food takes much longer to break down than before
• Larger pieces pass through mostly whole
• No jamming or unusual noise, just weak performance
• Unit has been in service for several years

Likely causes

• CommonWorn impeller and grind ring surfacesThese components wear smooth with years of use and can't be sharpened.
• CommonFeeding food too quickly for the unit's powerLarge batches can seem like dull blades when it's really overload.
• PossibleLow horsepower unit reaching the limits of daily household use1/3 HP units are more prone to feeling underpowered over time.

What to do

1. Feed food in smaller amounts with the water running the entire time.
2. Run a handful of ice cubes through the disposal to help clean and slightly refresh the grinding surfaces.
3. Cut larger or tougher scraps into smaller pieces before feeding them in.
4. Check that the flywheel spins freely with no drag using the hex wrench and power off.
5. If performance is clearly weaker than when the unit was new, understand that impeller wear isn't something that can be sharpened or restored.
6. Consider replacing with a higher horsepower model (1/2 HP or more) if your household generates a lot of food waste.

Tools and parts

• 1/4-inch hex wrench
• Ice cubes

When to call a pro

If performance has clearly and permanently declined, replacing the unit is the practical fix since the grind components aren't user-serviceable.

Safety