How to Unblock Your Bath or Shower Drain


A blocked bath or shower drain is one of the most common problems you’ll come across in the everyday use of your bathroom. If it’s completely blocked and the water simply isn’t draining, you can forget that nice hot bath or shower you were looking forward to.

Even if the water is simply slow to drain, over time this will cause a slippery build-up of soap scum, dirt and grime on the bottom of the bath or shower tray that could be dangerous at worst, or just plain unsightly at best. Whichever form your pesky blockage has taken, it needs fixing.

Luckily, it’s usually not too difficult to unblock a bath or shower waste yourself, so there’s no need to call a plumber just yet. There are a number of DIY methods you can try to clear the blockage, and in this article we’ll have a look at a few of them and talk you through what you need to do.


Clearing Out the Blockage

The first step is to take a look and see if you can spot what’s causing the blockage. Remove by lifting or unscrewing (whichever works for your type of waste) the chrome cover of your waste, or pulling out the plug if you’ve got an old school plug and chain variety.

The culprit is usually a build-up of hair and soap scum, so if you can spot hair in the bottom of the drain, see if you can’t just reach in and pull it out. Nasty business, but better than a plumber’s invoice and an empty wallet.

You could also try a coat hanger, some pliers, or whichever form of improvised grabbing tool you can find. If this doesn’t work, it’s time to move on to your next form of attack.


Using a Plunger to Unblock the Drain

The plunger is the next obvious step to clear a blocked drain. You’ll need a ‘cup’ type plunger for clearing a basin, bath or shower blockage.  article plunger

• Make sure you don’t use any chemicals yet, as using a plunger with chemicals is inevitably going to splatter them all over your clothes or skin.

• You’ll need to have enough water in the bath or shower tray to completely submerge the cup of the plunger. Too much water and you’ll make a splashy mess, so use a bucket to remove the excess if you’re drain isn’t clearing at all.

• You will get better results if you can block off any outlets (overflow, another basin etc.), so if you can put a wet cloth in these drains then you will have a higher chance of succeeding with this method.

• Plunge with a vertical up-and-down action, keeping the handle straight and vertical. Tilting at an angle will reduce the force and potentially break the seal you’re making with the cap. Do this for 15-20 seconds and then have a look at the results.

• If the drain is still blocked after your first plunger attempt, repeat the process a couple more times as you may have simply moved the blockage further down the pipes.

If plunging doesn’t remove the obstruction, it’s time to bring out the snake…


Snaking a Drain

No, not that kind of snake (although they have been known to appear in toilets). A ‘snake’ or auger, is a long, flexible steel cable wound on a handle. Plumbers will often have an expensive electrical model, but you can buy a handheld snake for £10-20 or so.

article snake

Simply feed the snake down the drain, or if you’re clearing a bathtub blockage, you will need to feed the snake down the overflow opening. You will hit some resistance as you go past the trap, but keep feeding it and turning it to either break the clog up or hook onto the end of the clog, allowing you to pull it out.

If you don’t have access to a snake, or don’t want to buy one, there are some other methods you can try instead. 


Using Baking Soda and Vinegar to Unblock Your Drain

Baking soda on its own does a decent job of loosening grimy sludge from your drain, and when you add some vinegar as well you get a chemical reaction that should hopefully jolt the blockage loose. 

article drain

This isn’t a method that will work for the very troublesome blockages, but for slow-draining bath or shower wastes, this is a cheap, eco-friendly method worth trying.

• First pour a pot of boiling water down your drain. • Pour a small amount (perhaps half a cup) of baking soda down the drain. Let it sit there for a couple of minutes. • Follow it up with a cup of white vinegar and a little more hot water. Leave for 5-10 minutes.• Flush with boiling water.

You should be able to hear the chemical reaction as it bubbles away. With a bit of luck, the debris caught in your drain will be broken down.


Using Chemicals to Unblock Your Drain

Using strong chemicals to unblock a drain is not something we  recommend. This isn’t to say they don’t work (they do), but they are quite dangerous to use, and there’s plenty of horror stories.

article drain2

Any chemicals strong enough to unblock a drain will be damaging to the environment, so try other methods first of all.

Caustic Soda

Caustic soda, or sodium hydroxide, has fantastic degreasing qualities. It breaks down grease and fat, so it’s pretty good at unblocking drains. It’s cheap to buy, and creates a strong exothermic reaction (meaning it warms up) to break down the blocked drain. However, if you do choose to go down this route, be very careful. Make sure you follow the instructions very closely, and cover your eyes and skin.


Sulphuric Acid

Sulphuric acid is another chemical commonly used to unblock drains. It can chemically break down many materials, as well as generate heat to melt blockages.

In the UK, sulphuric acid drain un-blockers such as One Shot can be easily purchased at no great expense, and can clear pretty much any blocked drain by literally dissolving whatever is in its path. In the right hands and in the right environment, this harsh chemical is very effective at clearing drain blockages.

This said, it emits terrible fumes, corrodes, and can cause very serious harm to the skin if it comes into contact, or blindness if it gets in the eyes. It also has a very powerful chemical reaction when it meets water other drain-cleaning chemicals, and generates heat that has been known to cause explosions and eruptions of toxic fumes. For these reasons, it can only really be applied to a mostly dry drain.

Moreover, there are plenty of reports of it literally melting through pipework. In theory, its chemical composition means it shouldn’t attack the plastic directly itself, but perhaps in these cases it has reacted with the sealant or split the pipe due to the heat created as a by-product.


So there you have it – several methods of DIY drain unblocking that might save you a plumber’s fee. If you do opt to go down the chemical route, be very careful, keep your skin and eyes covered, and follow instructions to the letter. If you can’t unblock the drain yourself, I’m afraid it’s time to get your wallet ready and call out that plumber. 


2 thoughts on “How to Unblock Your Bath or Shower Drain”

  • Andrew baker jones

    My shower drainage pipe is made of polyvynile chloride is hot water and washing soder with vinegar suitable for solving a blockage?

  • Expert Home Safety

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    Regrettably, lots of people today don't agree with me and recommend a assisted living facility for their older loved
    ones. I have actually tweeted a link to your blog site and
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    Thanks once again for your quality post.

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