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-$100

Minimum power. Fine for light use, soft foods only. Jams more easily. Budget apartments.

1/2 HP - Standard

$100-$150

Good for average household. Handles most food waste. Most common replacement choice.

3/4 HP - Better

$150-$250

Handles tougher scraps: chicken bones, fibrous vegetables. Less jamming. Worth the upgrade.

1 HP+ - Premium

$250-$400

Grinds 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

  1. 1Turn off power at breaker. Test with voltage tester to confirm.
  2. 2Disconnect drain pipe and dishwasher drain line if connected.
  3. 3Remove old disposal by turning mounting ring counterclockwise.
  4. 4Install new sink flange with plumber's putty (if replacing).
  5. 5Connect electrical wires (black to black, white to white, green to ground).
  6. 6Mount disposal to mounting ring. Twist to lock.
  7. 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