Garbage disposal calls are one of the most common service requests we receive at Cotton City Plumbing — and most of them are preventable. The garbage disposal is a convenient appliance, but it's widely misunderstood. It's not a trash can for food scraps, and it's not as tough as it sounds. Understanding what your disposal can and can't handle will save you from a jammed unit, a clogged drain, or an expensive service call.
What Your Garbage Disposal Can Handle
A properly functioning garbage disposal is designed to grind soft food waste into small enough particles to pass safely through your drain pipes. Foods that work well include soft fruits and vegetables, cooked meat scraps (in small amounts), ice cubes (which actually help clean the grinding chamber), citrus peels in small quantities, and most liquids.
The key word is soft. Your disposal uses impellers — not blades — to grind food against a grinding ring. It's effective on soft, water-soluble food waste but was never designed to handle the wide variety of things people routinely put down it.
Always run cold water while using your disposal and for at least 30 seconds after you turn it off. Cold water keeps any grease that enters the drain in solid form so it can be ground up and flushed through, rather than coating your pipes as liquid grease does.
What Will Damage or Clog Your Disposal
These are the items that cause the majority of garbage disposal problems in Lubbock homes:
Grease, oil, and fat — This is the single biggest cause of kitchen drain clogs. Even if you run hot water while pouring grease down the drain, it will cool and solidify further down the pipe, building up over time until the drain is completely blocked. Always pour grease into a container and throw it in the trash.
Fibrous vegetables — Celery, asparagus, artichokes, and corn husks have stringy fibers that wrap around the disposal's impellers and cause the motor to jam or burn out. These belong in the trash or compost bin.
Starchy foods — Potato peels, pasta, rice, and oatmeal expand when wet and create a thick, paste-like substance that coats your pipes and causes stubborn clogs. A handful of potato peels can create a clog that requires professional drain cleaning to clear.
Bones and hard shells — Chicken bones, shellfish shells, and fruit pits are too hard for most residential disposals to grind effectively. They'll bounce around the grinding chamber, potentially damaging the impellers or motor.
Coffee grounds — This one surprises people. Coffee grounds seem harmless, but they accumulate in the trap and drain line, creating a dense, muddy sludge that's difficult to flush out.
Eggshells — There's a persistent myth that eggshells sharpen disposal blades. They don't — disposals don't have blades. The membrane inside eggshells can wrap around the grinding mechanism, and the ground shell particles can accumulate in the drain.
How to Fix a Jammed Disposal Yourself
If your disposal hums but doesn't grind, or makes no sound at all when you flip the switch, it's likely jammed or tripped. Before calling a plumber, try these steps:
Step 1: Turn off the disposal and unplug it (or turn off the circuit breaker). Never put your hand inside a disposal — even when it's off.
Step 2: Press the reset button on the bottom of the unit. If the disposal tripped its thermal overload protector, this will reset it. The button is typically a small red or black button on the underside of the unit beneath the sink.
Step 3: Use the hex wrench that came with your disposal (or a standard ¼-inch hex key) in the hole at the center of the bottom of the unit. Turn it back and forth to manually free the grinding plate. Most disposals come with this wrench; if you don't have one, they're available at any hardware store for a few dollars.
Step 4: Use disposal tongs or pliers (not your hand) to remove any visible debris from inside the unit.
Step 5: Plug it back in, press reset, run cold water, and try again. If it still doesn't work after these steps, the motor may have failed and the unit needs replacement.
When to Replace Your Garbage Disposal
Most garbage disposals last 8–15 years with proper use. Signs that replacement makes more sense than repair include: the unit leaks from the bottom (the internal seals have failed), it requires frequent resets, it makes loud grinding or rattling noises even when empty, or it's simply old and inefficient.
Garbage disposal replacement is a straightforward job for a licensed plumber and typically takes less than an hour. Cotton City Plumbing can recommend the right size and horsepower for your household's needs — a ½ HP unit is fine for a single person or couple, while a family of four or more benefits from a ¾ HP or 1 HP model that can handle larger volumes of food waste without jamming.