Drainage doesn't slow overnight. It's usually build-up on the pipe walls gradually narrowing the channel. Finding the cause is the key to fixing it.
Common Causes
- Bathroom basin: hair tangled with soap scum.
- Kitchen sink: congealed grease and food residue.
- Long-term scale and mineral deposits.
- Loose traps or debris stuck in fittings.
Everyday Prevention
- Use a drain strainer and clear hair and debris regularly.
- Don't pour cooking oil or soup straight down the sink.
- Flush with hot water periodically to reduce grease build-up.
- Clean early when flow slows. Don't wait for a full blockage.
If it's still slow after cleaning the strainer, or comes with a smell, the build-up is usually deeper inside the pipe. Professional high-pressure cleaning or unblocking is needed to fully resolve it.