The challenges of clearing 90mm drains

10mm might not seem like a very large amount, but when it comes to clearing drains it can make a huge difference in the result.

For a very long time, 100mm PVC has been the standard diameter for both stormwater and sewer drains.

But in the past 5 years or so, 90mm PVC has become much more popular. This difference of just 10mm between the two sizes of drainpipes can lead to a number of complications if the drain gets blocked and needs clearing.

The first problem with 90mm drains is that a getting a camera or drain clearing equipment around a 90°bend is very tight in the first place. Should that drain then have two or three bends, getting equipment around all those bends becomes almost impossible.

The second problem is that many 90mm drains are laid with a “T-junction” joint, rather than a junction that joins at a 45° angle. Putting a camera down a drain with a T-junction, means the camera can easily go either way through the joint, causing a great deal of confusion for the camera operator who cannot tell which way he is looking.

90mm PVC drains are often made of recycled material, which makes them more susceptible to squashing as they are less rigid than 100mm pipes.

You are most likely to find 90mm pipes in new houses built during the past five years or so where it has almost replaced 100mm.  Unfortunately many 90mm stormwater drains are often not laid completely in compliance with regulations and so they do have a tendency to have issues.

So if your drains are 90mm in diameter, please understand that they may take longer to clear than regular drains and that in some cases we might not be able to get all the way through to the blockage.

We won’t therefore be in and out in an hour, like we can with some drains.

Please let us know, if you know, that your drains are 90mm, before we come out.
It will help us manage your expectations better.



The Drain Man are Australia’s original specialists in blocked drains & plumbing services. Servicing MelbourneSydney and many other regions throughout Australia, we have over 15 years expertise in drain reliningblocked drain plumbingCCTV drain inspections, blocked toilets, sewerage systems, overflowing drain services and other drain/sewer/pipe related services.