# How drain camera inspection works and what it shows

Source: https://cantleyvidanjoraltyapi.com/en/blog/drain-camera-inspection/

Published: 2026-10-17

## In short

- The camera is fed into the pipe on a flexible cable, through a drain opening or a manhole.
- On screen you can tell grease, roots, cracks, shifted joints and sagging sections where water stands.
- The position of the problem is marked from outside with a receiver, and if breaking is needed, only that spot is opened.
- Ask them to show you the frame where the problem appears and its distance from the entry point.

A drain camera inspection is done by pushing a flexible cable with a small lit camera on its end into the pipe through a drain opening, while the inside of the pipe is watched live on a screen. This way grease build-up, roots, cracks, shifted joints and sagging sections where water stands are seen as they are, without guesswork.

The homeowner or building manager can also stand by the screen during the inspection. Knowing in advance what you will see makes it easier to read the footage and to understand the decision that follows.

## What happens before the camera enters the pipe?

First, the point where the camera will enter the line is chosen. This can be a manhole cover, a cleaning access point, a trap that has been removed or a floor drain. The choice is made by the shortest route with the fewest bends to the section to be inspected.

If the line is completely blocked and full of water, the camera shows very little at first. In that case a short unblocking or flushing is usually done first, and the footage is taken afterwards. A camera moving through dirty water gives a cloudy picture and can lead to a wrong reading.

On a toilet line, the camera is often sent in from the nearest cleaning access point or manhole without lifting the toilet. If the shared stack of a building is to be checked, the entry point may be the manhole in the basement or garden. In that case, informing building management beforehand speeds up the job.

## What you may see on the screen

As the camera advances, the distance the cable has travelled is shown in metres in one corner of the screen. A clean PVC pipe looks light-coloured and smooth, while a cast iron pipe is darker and rough. The most common sights and what they mean are listed below.

What you see in a single frame does not always mean a big problem. A thin line at a joint or a little water at the bottom can be considered normal. What matters most is how long a section the finding spreads over and how much it obstructs the flow of water.

- Grease build-up: a yellowish, thick and soft layer on the pipe wall, seen especially on kitchen lines.
- Sediment and limescale: a hard, layered deposit on the bottom of the pipe.
- Roots: plant roots that enter through the joints, either like fine hairs or in thick bundles.
- Cracks and breaks: a dark line on the pipe wall or a missing piece, sometimes with soil visible behind it.
- Shifted joint: a step between two pipes, and the camera jolts as it passes this point.
- Sagging section: a pool of water standing at the bottom of a line that otherwise runs straight.
- Foreign objects: a pile of wet wipes, a piece of plastic or building debris.

## How is the position of the problem marked from outside?

The position of the problem is found by following the signal of a small transmitter in the camera head with a receiver from outside. The technician moves the receiver over the floor or along the wall, finds the point where the signal is strongest and marks it. The distance shown on the cable also serves to confirm this mark.

With this method, the position of a crack or a blockage can often be narrowed down to a width of one or two tiles. If breaking is needed, only this section is opened, not the whole bathroom. With systems that can give depth information, how deep the pipe lies is also known before the work starts.

## What should you ask the technician during the inspection?

Ask the technician to pause on the frame where the problem appears, show it to you and explain what it is. The images on the screen move quickly and are hard to recall later. To make a sound decision, it is sensible to get the following information.

- How many metres from the entry point the finding is.
- Where the problem section falls on the floor or wall.
- Whether the condition seen will be fixed by cleaning or by repair.
- Whether the problem is in your own line or in a shared part of the building.
- If possible, a recording of the footage or photos taken from the screen.

## What do you have when the inspection is finished?

When the inspection is finished, you have a clear picture of which section of the line is sound and which is faulty. The technician describes what they saw in order: the type of finding, its distance from the entry point, its approximate position and the recommended work. If a build-up such as grease or sediment was seen, cleaning with high-pressure water jetting or a drain snake can often be done during the same visit, and the camera is sent in a second time to show that the pipe is clean.

If a crack, two pipes that have come apart or a sagging piece of the line appeared on the screen, the solution is repair, not cleaning, and its scope is discussed according to the footage. Whether replacing a short section is enough or a long stretch of the line must be renewed is easier to understand together with what you saw on the screen. Do not hesitate to ask to be shown the footage once more before you decide.

## When is a camera inspection really worth it?

A camera inspection is worth it when it is not known where or why the problem occurs, or when the work to be done involves breaking into floors or walls. There is no need to look at a screen for hair collected in the trap of a single sink. On the other hand, in the following situations, deciding without footage is often guesswork.

An inspection before buying can show a crack at the point where the flat connects to the stack, or a root that has entered the garden line, before you move in. This information lets you plan the scope and order of the renovation correctly from the start.

- If the same line blocks again within a few weeks or months after being cleared.
- If you want to know the condition of the drain line before buying a home or shop, especially in older buildings.
- If there is damp, subsidence or a smell in the garden, car park or basement.
- If breaking is planned and the exact position needs to be known.
- If it is disputed in a building which flat's line the problem comes from.

## Frequently asked questions

### Does a drain camera show a crack?

Yes, a drain camera shows cracks in the pipe wall, broken pieces and separations at the joints. If a fine hairline crack is hidden under grease or sediment, it can only be seen clearly after the line has been cleaned.

### What does a pool of water in the camera footage mean?

Water standing in a straight line shows that the pipe sags at that section or that its slope is reversed. This dip collects sediment and grease, and it is often the reason the same drain blocks frequently.

### Can I get a recording of the camera footage?

This depends on the device used. Most systems can record the footage or allow photos to be taken from the screen. Telling the technician before the inspection starts that you want a recording makes things easier.

### Does sending a camera into the pipe scratch the pipe?

No, because the camera cable is flexible and is advanced without forcing the pipe. If the camera cannot advance at a broken or very narrow section, the technician does not force it, but pulls it back and tries to enter from another point.

## Let's look inside your pipe together

For a repeated blockage or a line you are unsure about, call 0212 923 66 85 or write on WhatsApp, and we will carry out the inspection on site together with you.

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