# How is drain unclogging done with a robot?

Source: https://cantleyvidanjoraltyapi.com/en/blog/robotic-drain-unclogging/

Published: 2026-10-17

## In short

- In drain work, "robot" is the general name for a motorised machine that rotates its way through the pipe, together with the cutting and brush heads fitted to it.
- The job starts with a camera. The head and machine are chosen only after the type of blockage and the pipe diameter are seen.
- The robot enters through an existing drain opening, clean-out cover or manhole, so no tiles or walls are broken.
- A robot cannot repair a collapsed or broken pipe. In that case, line renewal is discussed.
- Every line differs in length, number of bends and type of blockage, so how long a job will take cannot be stated exactly in advance.

Robotic drain unclogging means feeding a flexible cable or shaft, turned by a motor, into the pipe, then breaking up the blockage with the cutting head on its end and scraping the pipe wall. The job starts with a camera and ends with a camera. The word robot makes people think of a small wheeled vehicle. Camera vehicles like that really are used in large-diameter sewer lines, but when someone says robot about the drain of a home, building or shop, they usually mean this motorised machine.

The real difference of this method is that you do not need to know where the pipe runs. The machine enters through an existing opening, follows the bends and reaches the blockage from the inside. Instead of breaking the floor to reach the pipe from outside, the pipe's own route is used.

## What exactly is the machine called a robot?

The robots used in drain work fall into three groups. What they share is a mechanism that rotates inside the pipe and has an interchangeable head. Which one is used depends on the pipe diameter, the pipe material and the type of blockage.

- Motorised drain snake: a steel cable coiled in a drum is turned by a motor and fed into the pipe. It is used for sinks, showers, kitchen drains and thin horizontal lines.
- Shaft cutting machine: chain, blade or brush heads are fitted to the end of a more flexible shaft. Chains spinning at high speed scrape hardened grease and limescale off the pipe wall. It works well in shared stacks and long lines.
- Camera sewer robot: a remote-controlled vehicle with its own camera and light, used in large-diameter main lines. It clears the pipe by cutting roots, concrete residue or connections that protrude into it.

## Which head goes with which blockage?

A robot's strength comes from its head more than from the machine itself. A machine working with the wrong head will punch through the blockage without cleaning the pipe, and the same blockage returns a few days later. That is why the picture on the camera decides the choice of head.

For fibrous blockages such as hair and wipes, a retrieving or corkscrew head is used. The head wraps around the blockage and brings it out when pulled back. For a layer of hard grease built up in kitchen lines, chain heads rotate along the pipe and scrape the layer away. For tree roots that have entered underground lines, blade and saw-toothed heads cut the roots. For old limescaled pipes, brush heads clean the surface without forcing it. On PVC pipes, softer heads and controlled speed are preferred so the plastic is not damaged.

## What do you see, step by step, in a robot job?

When the team arrives at the address, the job usually runs in the same order. You can see what is being done at every stage and watch the picture on the screen together with us.

- First we listen to you: which drain has been slow and for how long, where the water comes back from, what has been tried before, and whether any chemicals were poured in.
- The camera is fed into the line, and the location and type of the blockage and the condition of the pipe appear on the screen.
- The entry point for the robot is chosen: a drain opening, a clean-out cover or a manhole in the garden.
- The area around the entry point is protected and a cover is laid on the floor.
- The suitable head is fitted, the machine is fed into the pipe and the blockage is broken up. The waste that comes out is collected.
- The line is flushed with high-pressure water or plenty of water so the loosened material is carried on to the main line.
- The camera goes in again and we check together that the pipe is clean.

## What a robot cannot do

A robot is made to clear blockages and build-up inside the pipe. If the pipe itself has a fault, it cannot fix it. This is where the camera footage matters, because it is the only thing that shows these faults.

A broken or collapsed pipe keeps taking in soil and waste even after the robot has passed through. A line with a reverse gradient holds water and fills up again even after it is cleaned. Pipe joints that have slipped apart catch sediment. In such cases the camera recording is shown to you, solutions such as line renewal or PVC pipe replacement are discussed, and the decision is yours. Some hard objects, for example a metal piece that has fallen into the pipe, cannot be broken up with a cutting head. We try to pull these out with a retrieving head.

## Why can't an exact time be given?

How long a robot job takes depends on what is inside the pipe, and that cannot be known before the camera goes in. Two drains with the same symptom can turn out differently: one has a clump of hair near the drain opening, the other a hardened layer of grease at the foot of the stack. The effort needed for the two is very different.

The main factors that affect the time are the length of the line, the number of bends, the pipe material and diameter, how easy the entry point is to reach, and the type of blockage. What you tell us on the phone gives an idea, but an honest time can only be discussed after the camera footage. That is why the team first tells you what it has seen, then what it will do.

## Can robotic unclogging damage the pipe?

Used with the right head and the right speed, a robot does not damage the pipe. The risk of damage appears when working in a pipe that is not sound, or with a head that is too hard on a plastic line. This is one reason the camera goes in first: the machine is not started until the material and condition of the pipe have been seen. In old and weakened pipes, lighter heads are chosen and, if needed, high-pressure water jetting is preferred to the robot.

## Frequently asked questions

### Are tiles broken when unclogging a drain with a robot?

No, tiles and walls are not broken when unclogging with a robot. The machine enters through an existing drain opening, clean-out cover or manhole and reaches the blockage from inside the pipe.

### What is the difference between a robot and a drain snake?

A drain snake is also a type of robot. The difference lies in power and the range of heads. A motorised drain snake is enough for thin drains, while shaft machines that take chain and blade heads are used in shared stacks and long lines.

### Does a drain cleared with a robot get blocked again?

If the pipe is sound and the cause of the blockage is gone, a drain cleared with a robot runs freely for a long time. If the pipe itself has a collapse, a break or a reverse gradient, the blockage can return. The camera footage shows this beforehand.

### Can a sewer line with tree roots in it be cleared with a robot?

Yes, lines with roots can be cleared by a robot using blade or saw-toothed heads. However, the roots enter at a pipe joint, so there is an opening at that point and the roots can grow back over time. For a lasting solution, the condition of the joint is assessed with the camera.

## Let's see which robot your drain needs

Tell us which drain has been causing trouble and for how long, via WhatsApp, or call 0212 923 66 85 and explain. The team first looks with the camera, tells you what it has seen and, after your approval, starts clearing with the robot.

Phone: 0212 923 66 85 (tel:+902129236685)  
WhatsApp: https://wa.me/905315687185