Grease, oil, and fat are common causes of drainage problems, even in homes where care is taken in the kitchen. These substances often enter the system in small, unnoticed amounts and build up gradually.
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How Grease and Fat Enter the Drainage System
Most grease enters drains during everyday washing up. Residue from cooking oils, sauces, and fatty foods mixed with hot water and flows away easily. Although plates or pans may look clean, small amounts of oil remain in the water and pass into the pipework without being seen. Northumbrian Water has a guide on fats, oils and grease in pipes.
Why Grease Builds Up Inside Pipes
Once inside the drain, grease begins to cool and solidify. Instead of flowing freely, it sticks to the inside of the pipe, forming a thin coating. Each use of the sink adds another layer.
How Grease Causes Blockages Over Time
As the pipe narrows, waste is more likely to catch on the sticky surface. Food particles and debris then build up, leading to slow drainage, gurgling sounds, and unpleasant odours. In some cases, a CCTV drain survey Leicester such as //www.wilkinson-env.co.uk/drainage-services-cctv-surveys-midlands/cctv-drain-surveys/leicester may be required to identify the extent of hidden grease.
The Wider Impact on Drainage Systems
Grease does not always remain near the sink and can move further into the drainage system. This can affect connected pipes and increase the risk of recurring blockages.
Grease, oil, and fat can quietly damage drains over time, so reducing what enters the system is key to preventing build-up.
Summary
Everyday washing up is the main way grease, oil and fat get into household drains, even when plates look clean. Once inside, grease cools and sticks to the pipe walls, building up in layers that narrow the pipe and trap food and debris. The result is slow drainage, gurgling and bad smells, and grease can travel further into the system to cause repeat blockages.
Questions this article raises
- What is the safest way to dispose of cooking oil at home?
- Do enzyme drain cleaners actually break down built-up grease?
- How can you tell whether a blockage is caused by grease or something else?
