Clearing a blocked drain is not one technique. It starts with a diagnosis, and then the engineer picks the right tool, because no single method suits every blockage. A grease blockage in a kitchen drain needs a different approach from a root mass in a clay pipe.

Knowing the options helps you understand what to expect, since each method suits a different blockage. This guide covers each method. For the full service, see our drain clearance service and blocked drains service.

Step One: Find the Blockage

Before clearing anything, the engineer works out where the blockage is. One slow fixture usually means a blockage in its own waste pipe. However, several fixtures backing up at once point to the shared drain or the main soil stack.

For unclear cases, a camera helps, because it shows whether the blockage is soft, like grease or hair, or something structural. Our guide on the CCTV drain survey explains the process.

Water Jetting

Jetting is the main method for most blockages, since it cleans as well as clears. A pump forces water through a nozzle. Forward jets drive through the blockage, and rear jets scour the pipe wall as the hose comes back.

This matters because a jet clears the plug and the build-up around it. Our guide on clearing your blockage with drain jetting covers it in depth. Jetting works well on:

Grease and fat in kitchen drains
Hair and soap scum in bathroom pipes
Silt and leaves in gullies and chambers
Scale on pipe walls
Loose roots after cutting

The engineer matches the nozzle to the pipe. Older pipes are fragile, so a camera check before jetting is wise. A careful engineer adjusts the pressure to suit the pipe, because too much force can harm weak joints.

Drain Rodding

Rodding means pushing flexible rods through the drain to move the blockage. It suits a clear one-off problem, for example wipes stuck at a soil stack outlet. The method is quick and simple.

Rods have a limit, though. They clear the plug but leave the build-up on the pipe wall. Therefore a recurring blockage usually needs jetting instead. See the page on a drain unblocker service for how visits run.

Root Cutting

Roots enter pipes through small cracks in clay joints. Once inside, they form a mesh that catches tissue and waste. Rods cannot shift an established root mass, since they bend around it.

A cutting head on a flexible shaft chops the roots, and a jet then flushes the pieces out. Even so, the crack stays open. However, without sealing it, roots tend to return. Read why we use drain relining for the lasting fix.

After Clearing

The engineer runs water through the system to check the flow. While small jobs end there, on bigger jobs a camera confirms the pipe is clear. Clearing can also reveal a hidden fault, such as a crack the blockage covered.

If a blockage keeps coming back, there is usually a reason, because debris rarely returns without one. Read about a main drain that keeps clogging. For a hands-on view, see how to unblock a blocked sewer pipe.

Why Clearing Matters

Regular care prevents bigger jobs, since small build-ups never get the chance to grow. Read why drain cleaning is important and how to keep your plumbing efficient. To learn who does this work, see what a drain specialist does.

Although most jobs can wait a day, some cannot. For emergencies, see why we offer 24-hour emergency drain services.

Areas We Cover

While we cover the wider area, we offer drain unblocking in Enfield, blocked drains in Barnet and drain clearance in Edgware. To book, use the online enquiry form. We offer same-day help for urgent jobs.