Plumbing Phase|Step 21 of 33
Replace Garbage Disposal
Old disposals are noisy, slow, and prone to jams. A new disposal grinds faster, runs quieter, and handles tougher scraps.
Time Required
1-2 hours
Cost
$80-$400
Difficulty
Moderate
Disposal Types by Horsepower
1/3 HP - Basic
$80-$100Minimum power. Fine for light use, soft foods only. Jams more easily. Budget apartments.
1/2 HP - Standard
$100-$150Good for average household. Handles most food waste. Most common replacement choice.
3/4 HP - Better
$150-$250Handles tougher scraps: chicken bones, fibrous vegetables. Less jamming. Worth the upgrade.
1 HP+ - Premium
$250-$400Grinds almost anything. Quietest operation with sound insulation. Best for heavy cooks.
Features That Matter
- Sound insulation: Premium models have SoundSeal technology. Worth it if near living areas.
- Stainless grind components: Last longer than galvanized steel. Won't corrode.
- Auto-reverse: Motor reverses to clear jams. Found on better models.
- Quick-mount system: Makes installation and replacement much easier.
- Power cord: Some include cord, some don't. Check before buying.
Installation Steps
- 1Turn off power at breaker. Test with voltage tester to confirm.
- 2Disconnect drain pipe and dishwasher drain line if connected.
- 3Remove old disposal by turning mounting ring counterclockwise.
- 4Install new sink flange with plumber's putty (if replacing).
- 5Connect electrical wires (black to black, white to white, green to ground).
- 6Mount disposal to mounting ring. Twist to lock.
- 7Reconnect drain and dishwasher line. Test for leaks.
Pro Tips
- •InSinkErator or Waste King: The two major brands. Both are reliable. InSinkErator is more common.
- •Match the mounting: If replacing InSinkErator with InSinkErator, you can reuse the mounting assembly.
- •Consider a switch upgrade: Air switch or toe-kick switch if wall switch is inconvenient.
- •Support the weight: Have someone help hold the disposal while connecting. They're heavy.
What NOT to Put in Disposal
- Grease and oil: Coats and clogs pipes
- Pasta and rice: Expands and clogs
- Egg shells: Creates gritty buildup
- Coffee grounds: Accumulates in traps
- Fibrous veggies: Celery, artichokes, corn husks wrap around blades
- Bones: Only small chicken/fish bones in powerful disposals