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Most People Don’t Realize These 25 Things Are Dangerous to Put Down the Sink
Your kitchen sink might seem like a convenient catch-all for cleaning up—but not everything should go down the drain. Many everyday items that people rinse or pour into the sink can clog pipes, damage plumbing, and even harm the environment. While it might seem harmless in the moment, what goes down the drain doesn’t always disappear—it can cause serious problems in your plumbing or local water systems.
Here’s a list of 25 surprising things you should never put down the sink, even if they seem safe. Trust us—your pipes and your plumber will thank you!
1. Grease, Fat & Oil
The #1 culprit. These cool and solidify inside pipes, leading to thick blockages known as “fatbergs.” Always pour used grease into a container and dispose of it in the trash.
2. Coffee Grounds
They don’t break down in water and clump together with grease, creating stubborn clogs.
3. Eggshells
Tiny shell fragments combine with grease and other debris, forming a gritty paste that clogs pipes.
4. Pasta
It expands with water and becomes a gluey mess in your pipes—especially problematic in large quantities.
5. Rice
Like pasta, rice swells in water and can cause serious blockages over time.
6. Flour
When mixed with water, flour becomes a sticky, dough-like substance that clings to pipes and traps other debris.
7. Potato Peels
They can become starchy and stringy, sticking to the sides of your pipes and creating blockages.
8. Onion Skins
These thin layers can pass through a garbage disposal but get stuck in pipes, causing clogs.
9. Banana Peels
They’re fibrous and don’t break down easily, making them difficult for garbage disposals to handle.
10. Celery & Stringy Vegetables
Their fibrous strands can wrap around disposal blades or clog pipes.
11. Fruit Pits or Seeds
Too hard and too large—bad news for garbage disposals and plumbing alike.
12. Bones
Even small bones can damage garbage disposals or get lodged in your plumbing system.
13. Dairy Products
Milk, cheese, yogurt, and cream don’t clog pipes directly, but they contribute to fat buildup and can sour in your drain, causing unpleasant odors.
14. Medication
Flushing pills or liquid medications down the drain can contaminate water supplies and harm aquatic life.
15. Harsh Chemicals & Cleaners
Bleach, paint, drain cleaners, or solvents can damage pipes and pollute water systems.
16. Paint (Even Water-Based)
Paint can coat the inside of pipes and contribute to clogs—or worse, contaminate waterways.
17. Paper Towels
They’re not made to dissolve like toilet paper and can easily cause major blockages.
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