A bath that empties slowly is one of the more common household plumbing annoyances, and in the vast majority of cases the cause is a build-up of hair and soap scum rather than anything structural. This guide covers how to clear it yourself before considering calling a plumber.
How Do You Fix a Slow-Draining Bath?
To fix a slow-draining bath, remove the plug and overflow cover to check for visible debris, use a bent wire hook or a specialist drain tool to pull out hair and buildup, then flush the drain with baking soda and vinegar followed by hot water. Most slow-draining baths are caused by hair combined with soap scum forming a dense clog just below the plughole.
What You Will Need
- A screwdriver, for the overflow cover
- A wire coat hanger, straightened with a small hook bent at one end
- A drain snake or specialist hair removal tool
- Baking soda and white vinegar
- Rubber gloves
How to Fix a Slow-Draining Bath: Step by Step
1. Remove the Plug
Take out the bath plug, or unscrew a pop-up style plug mechanism, and check for visible hair or debris caught around it, which is often the first and most accessible clog point.
2. Check the Overflow
Unscrew the overflow cover, since some baths drain through a linked overflow and plughole system where hair can collect in either point.
3. Fish Out Hair With a Wire Hook
Feed a straightened wire coat hanger with a small hook bent at the end into the drain, twisting gently to catch and pull out hair and debris. This alone often clears a significant portion of the blockage.
4. Use a Drain Snake for Deeper Blockages
For a blockage further down than a wire hook can reach, a drain snake or specialist hair removal tool can extend further into the pipe to catch and remove trapped material.
5. Flush With Baking Soda and Vinegar
Pour around half a cup of baking soda down the drain, followed by half a cup of white vinegar. Leave the mixture to fizz and work for 15 to 20 minutes, then flush through with a kettle of hot water.
6. Test the Drain
Run the tap briefly and check how quickly water drains away. If flow has improved but is still not fully clear, repeat the process, since stubborn blockages sometimes need more than one round of treatment.
Preventing Future Slow Draining
- Use a drain hair catcher: a simple mesh cover over the plughole catches hair before it enters the pipe.
- Flush periodically with hot water: running hot water down the drain regularly helps prevent soap scum building up as thickly.
- Clean the overflow occasionally: since it can collect hair and grime just as easily as the main plughole.
If your shower is affected by a similar issue, our guide to unblocking a drain covers the same approach for other bathroom fixtures.
Frequently Asked Questions
Why does my bath drain slowly even after cleaning the plughole?
The blockage may sit further down the pipe than a quick plughole check reaches, so a drain snake or a baking soda and vinegar flush can help clear buildup deeper in the system.
Is it normal for a bath to drain more slowly over time?
Gradual slowing is common as hair and soap scum accumulate, which is why periodic maintenance, such as a hot water flush, helps prevent a full blockage developing.
Can I use chemical drain unblockers on a bath?
They can help with grease and soap scum, but should be used as a last resort, since repeated use of harsh chemicals can affect older pipework over time.
How do I know if the blockage is in the overflow or the main drain?
If water drains slowly even with the overflow blocked off or covered, the main plughole drain is the likely culprit. If covering the overflow makes little difference, checking both points is worth doing regardless.
When should I call a plumber for a slow-draining bath?
If DIY methods do not improve drainage after a couple of attempts, or the problem recurs frequently, it is worth calling a plumber to investigate further down the waste system.
Always wear gloves when clearing hair and debris from a drain, and never mix bleach with other chemical cleaning products.
About the Author
Spire Homes Editorial Team researches and writes practical, UK focused home improvement guides covering renovation planning, financing, interior design, and property maintenance. Our content is reviewed for accuracy and updated as guidance changes.
