Two major areas of the homes drainage system are the waste pipes and the traps.

It is vital to ensure that your drainage system runs smoothly. Most new build properties and newer systems use plastic pipes and fittings.

If you notice that your sinks or basins are draining slower than usual this indicates that there is a blockage. It is better to fix blockages as soon as you notice them; blockages left unattended can become more difficult to repair.

Waste pipes are bigger than supply pipes, in order to be able to support what might come down them via the waste. Basins have usually a 32mm waste pipe while showers, washing machines, sinks and baths have a 40mm pipe.

All waste pipes must slope at a rate of at least 20mm per metre as a minimum to ensure the free flow of water.

Modern systems have changed a lot:  older systems were made of lead while newer systems are now made out of plastic and in most cases use simple push-fit connectors that contain rubber ring seals.

So… what can you do if you have a blocked waste pipe?

plunger.jpgStep 1: Use the plunger

Partly fill your sink with water and position the sink plunger over the plug hole.

Using a damp cloth place this in the overflow to prevent any loss of pressure. Push the plunger up and down vigorously. Pull the plunger away and see if the water drains smoothly.

Repeat the process a few times.

Step 2: Use chemical drain cleaning product


If physical clearance of the blockage does not work, the next step is to use a chemical drain cleaning product.

You must wear protective gloves and eye protective googles when using chemical drain cleaner as it is very toxic. 

It is always a good idea to use some petroleum jelly around the rim of the plug-hole to protect it from damage. Read and follow the instructions on the chemical bottle.

Step 3: Remove the waste trap and clear blockage manually

Depending of the actual cause of the blockage, sometimes the chemical cleaner is not enough either to clear the blockage of the waste pipe.

The next step is to remove the waste trap and clear the blockage manually.

Place a bucket under the catch to catch anything (residual water and other things blocking the waste pipe) that might fall out when unscrewing the trap.

Unscrew the trap and clear its contents.

When reconnecting make sure to replace any washers or O-rings.

Pay close attention to not over tighten the trap as it can prove difficult if you need to come back and open it again.

Step 4: Call a plumber in your local area

Service-Area-Plumbing-Services-Stanfordville-NY.jpgHopefully by now you have managed to clear the block on the waste pipe.

If, however you cannot gain entry to the trap or the block still persist, it is then time to call in a good plumber.

Read how to select a good plumber here.

Plumber in Doncaster, Rotherham, Barnsley, Sheffield and beyond

If you live in South Yorkshire, why not give us a call to see how we could help. Our local plumbers cover the whole of South Yorkshire and beyond, not just the large towns and cities, such as Doncaster, Barnsley, Rotherham and Sheffield.

For all your plumbing needs, from simple tap changes to full bathroom and boiler changes.

Also our plumbers cover 24/7 the whole of South Yorkshire, so if you have a gas or plumbing emergency call us immediately.


Why not give us a call for a FREE quote on 01302 822 847.

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