Why are cooking oils and grease a problem for wastewater pipes?

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Why are cooking oils and grease a problem for wastewater pipes?

When many people are finished cooking, they tend to dump leftover cooking oil, grease, and/or food scraps down the sink and turn on the garbage disposal. Another common mistake is rinsing dishes in the sink with hot water to remove the grease residue left on plates. Hot water may serve only to push the potential clog further down the pipe.


Fat, cooking oil and grease are only partially soluble in water and are not compatible with wastewater piping. If poured down the drain, these substances thicken, coagulate, and stick to the drainage piping, forming gooey-gross deposits that grow each time more greasy waste enters the pipes. Whether these deposits form in the homeowner's wastewater pipes or the city sanitary sewer lines, the end result is a clogged pipe and costly repairs. These blockages may also be accompanied by foul odors, significant property damage, and even environmental harm.


How should I dispose of cooking oil and grease?

1. Collect small quantities of cooking oil or grease in a coffee can, empty milk carton, or similar container (preferably with a lid so it doesn’t pour out); optionally, it can be mixed with kitty litter, and doubled bagged; chill grease in the fridge if you need to get it to harden up.

2. Toss this item in your trash cart, or even better, recycle it at your City's Resource Recovery’s Recycle & Reuse Drop-off Center

3. Put greasy food scraps in the trash…unfortunately, very greasy and oily food cannot be composted.

4. Try not to put greasy food scraps in the garbage disposal.

5. Use a sink strainer to catch food particles.

6. Use a paper towel to wipe grease from pots, pans, plates, and utensils prior to washing.


Zhejiang Rosun Kitchen & Bath Technology Co., Ltd. is a manufacture of quality garbage disposer and accessories since 1992 with a registered capital of USD 1.5 million. It’s located in Yuhuan, Zhejiang Province of China, covers areas of 75,347 sq. ft, owns 129,167 sq. ft of workshop with more than 200 experienced workers and staffs.


Rosun established Disposer laboratory with an independent R&D team, together with a complete production system from moulding, casting, precision machining, polishing and assemble workshop since it’s founded, HomeAid has provided professional OEM & ODM services for numerous customers overseas and domestic.



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Adam Liu

Sales Manager


Zhejiang Rosun Kitchen & Bath Technology Company

Address: Qinggang Industrial Cluster District, Yuhuan City, 317606, Zhejiang Province, China

Tel: +86-15968803981

Fax: +86-0571-87298697

Email: service@rosun.com