How To Fix a Slow-Draining Tub

A tub that drains slowly could indicate serious plumbing problems, but it’s more likely that your drain just needs a quick fix. Many slow drain issues can be fixed without on your own without hiring a plumber.

Our guide will help you identify the cause of your slow drain, learn some do-it-yourself solutions, and understand when to seek professional help.

Understanding Tub Drain Anatomy

To identify the cause of the problem, you’ll need to understand the different parts of your bathtub’s drainage system. Here’s a breakdown of the key components.

• Drain cover or stopper: This device at the bottom of your tub regulates water flow and prevents large objects from entering the drain.
• Tub drain: The opening at the bottom of the tub that leads to the drainpipe.
• Overflow tube: A safety feature that prevents water from spilling over the tub’s edge if the water level gets too high.
• P-trap: A curved section of pipe that holds water to prevent sewer gasses from entering your bathroom.
• Drain line: The pipe that carries water away from your tub to the main sewer line.

Signs Your Tub Is Draining Slowly

Recognizing the early signs of a slow-draining tub can help you address the issue before it becomes a major problem. You may have a slow drain issue if you notice any of these signs.

• Water pooling around your feet during showers
• Tub takes longer than usual to empty after use
• Gurgling sounds coming from the drain
• Unpleasant odors coming from the drain
• Visible debris or scum around the drain opening

Causes of a Slow-Draining Tub

Below are some common issues that can cause a tub to drain slowly.

Hair and Soap Scum Buildup

The most frequent culprit behind slow-draining tubs is hair and soap scum buildup. Over time, these materials can accumulate in the drain, creating a stubborn blockage that restricts water flow. This type of clog usually occurs near the drain opening or in the P-trap and can be removed using DIY methods.

Foreign Objects

Small objects like children’s toys, jewelry, or even excessive amounts of bath products can find their way into the drain, causing a blockage. These items can get lodged in the drain or P-trap, obstructing water flow and leading to slow drainage.

Drain-Fitting Problems

If your tub’s drain fittings are not adequately sealed or damaged, they can prevent proper water flow. We recommend having a professional check these components and assess their condition. 

Pipe Corrosion

Pipe corrosion can be a significant factor in slow-draining tubs in older homes. As pipes age, they can develop rust and mineral buildup, narrowing the pipe’s interior diameter and restricting water flow. This issue is more challenging to address and may require professional intervention.

Essential Tools for Unclogging a Tub Drain

Most of the problems we just mentioned can be easily fixed yourself. Before attempting a DIY fix, check to see if you have the following tools that will make the process easier. 

• Auger: An auger consists of a long, flexible metal cable with a coiled spring or cutting head at one end and a handle or crank at the other. The auger is inserted into the drain, and the handle is turned to extend the cable through the pipes. The coiled end of the auger can break up or latch onto the clog, allowing it to be pulled out or pushed through the drain to clear the blockage.
• Plunger: A plunger is a simple yet effective tool for clearing clogged bathroom drains. For tub drains, choose a flat-bottomed plunger rather than the flange type used for toilets.
• Drain snakes: Drain snakes come in various lengths, and they’re excellent for reaching deeper clogs and breaking up stubborn blockages. Drain snakes are relatively cheap, but you may also be able to use a wire hanger in a pinch.
• Bucket: Keep a bucket handy for catching any water or debris you might dislodge during the process.

Chemical Drain Cleaners

Remember to use chemical drain cleaners cautiously and only as a last resort. These products can be harsh on your pipes and the environment. If you decide to use a chemical cleaner, carefully follow the manufacturer’s instructions and ensure proper ventilation in your bathroom. Only use chemical drain cleaners that are made for tub and shower drains. 

DIY Methods To Fix a Slow-Draining Tub Drain

Below are some common DIY methods to fix your slow-draining tub.

Plunger Method

This method works best for minor clogs near the drain opening:

1. Remove the bathtub drain cover or stopper.
2. Fill the tub with a few inches of water to cover the drain opening.
3. Place the plunger over the drain, ensuring a good seal.
4. Plunge vigorously for 20–30 seconds.
5. Remove the plunger and check if the water drains quickly.
6. Repeat if necessary.

Boiling Water Method

Boiling water helps break down soap scum and grease buildup:

1. Boil a kettle full of water.
2. Carefully pour the boiling water directly down the drain in stages.
3. Wait for a minute between each pour to allow the hot water to loosen the debris.
4. Repeat as necessary.

Baking Soda and Vinegar Solution

This natural, eco-friendly method helps dissolve clogs caused by soap scum and minor hair clogs:

1. Remove standing water from the tub.
2. Pour 1/2 cup of baking soda down the drain.
3. Follow with 1/2 cup of white vinegar.
4. Cover the drain with a wet cloth.
5. Wait 5–10 minutes.
6. Flush with hot water.

Manual Hair Removal

This method is effective in tackling recent hair buildup and visible hair clogs near the drain opening:

1. Remove the drain cover or stopper.
2. Use a flashlight to inspect the drain.
3. Wearing gloves, reach into the drain and remove any visible hair or debris.
4. Use a drain snake or bent wire hanger to reach deeper if necessary.
5. Flush with hot water.

Drain Auger Technique

This technique can help you reach deeper clogs in the P-trap or drain line:

1. Remove the drain cover or stopper.
2. Insert the auger into the drain opening.
3. Gently push the auger while turning the handle clockwise.
4. When you feel resistance, continue turning to break up the clog.
5. Slowly retract the auger, removing debris as you go.
6. Flush with hot water.

Wet and Dry Vacuum Method

Using a wet and dry vacuum can be more effective than plunging and provides a less invasive way to clear clogs:

1. Set the vacuum to “liquid” or “water” setting.
2. Create a tight seal around the vacuum hose and the drain.
3. Turn on the vacuum to suction the clog out.
4. Repeat if needed.

When To Call a Professional Plumber for a Slow Drain

While many slow drain issues can be resolved with DIY methods, some situations require professional expertise. Consider calling a plumber if you notice one or more of the following issues:

• DIY methods fail to improve drainage
• You suspect pipe damage or corrosion
• Multiple drains in your home are slow
• You notice sewage odors or backups
• Your home has old or deteriorating pipes

If you’re considering hiring a professional, we recommend getting quotes from at least three companies to find the best pricing. If you have home warranty coverage, review your contract for plumbing coverage and use those services to save time and money. 

Preventing Future Slow Drains

We recommend taking the following steps to help prevent future slow-drain issues and extend your plumbing system’s life.

Regular Tub Drain Maintenance 

Regular maintenance keeps your tub draining smoothly and helps avoid future costly plumbing repairs, like serious clogs or needing a replacement tub drain.

• Flush drains weekly with hot water to prevent buildup
• Use a mixture of baking soda and vinegar monthly for natural cleaning
• Avoid disposing of grease or oil down any drain
• Clean and take care to maintain bathtub drain stoppers and covers regularly to remove hair and debris

Installing Tub Drain Covers

Using a quality drain cover or hair catcher can significantly reduce the amount of hair and debris entering your drain. These inexpensive devices are easy to install and clean, making them an excellent preventive measure.

Scheduling Professional Plumbing Inspections

Consider scheduling regular plumbing inspections to detect issues early. A professional plumber can uncover minor problems before they worsen, ensuring efficient drainage.

Our Conclusion

A slow-draining bathtub can be frustrating, but by identifying the cause of the slow drain and applying the right solution, you can often restore proper drainage without calling a plumber. You may need to consult a professional for persistent issues, suspected pipe damage, or if you’re uncomfortable performing the repairs yourself. Regular maintenance and preventive measures can go a long way in keeping your tub draining smoothly and avoiding more serious plumbing problems in the future.