Problem Down There: These Items Don’t Belong in Your Waste Disposal

A person throwing left over food in the trash

The waste disposal under your sink can get rid food scraps immediately, but their powers have limitations. If you carelessly throw any waste down there, repairs are likely to follow in just a matter of time. Waste disposals may have a set of sharp, grinding shredders that can disintegrate almost any type of food waste, but this does not mean that it is okay to throw anything down.

Plumbers in Christchurch, Walton Plumbing note that if you put the following food scraps at your disposal, you are setting it up for plumbing problems and repairs later on.


Regardless of how tiny you think they are, bones don’t belong at the disposal. If you are fortunate enough to get them down, they might cause a problem in the drain pipes.


Oil or grease may be liquid, but they can solidify and cause blockages in your pipes. Doing this regularly can dull the disposal blades/shredder while also leaving a smelly odour down the sink. This can also result in gluggy pipes.

Egg shells

Your disposal may be able to pulverise the shells, but this leaves a consistency that resembles sand. This can build up in the pipes and cause problems later on.

Coffee grounds

They may go down easily, but the grounds can pile up and leave a sand-like mess in the drain. It is best to spread the grounds around the gardens for repelling insects.

Pasta and rice

They may seem soft, but rice and pasta absorb water easily (and then expand). They can cause remnants in the disposal’s chamber, which may later on form into a sticky paste

Certain vegetable peels

Potato peels, as well as fibrous veggies like celery, asparagus, artichokes, lettuce, carrots, and onion skins, can cause problems in the disposal’s grinding teeth.

While the waste disposal is strong kitchen machinery, you should still mind what you throw down there. Apart from the things mentioned above, you should also avoid putting down non-food scraps such as sponges, cigarette butts, fabric, and paper towels.