When a drain blocks up, most people reach for one of two things: a bottle of drain cleaner from the supermarket, or the phone to call a plumber. The gap between those two options is bigger than most people realise.
Jet blasting – also called high-pressure water jetting – is one of the most effective ways to clear a blocked drain. Here’s how it works, what it can and can’t do, and why we recommend it over chemical products every time.
What Jet Blasting Actually Does
A jet blasting machine forces water through a specialised nozzle at very high pressure – typically between 4,000 and 5,000 PSI. That nozzle goes into the drain via an access point, and the pressurised water blasts forward to break up and flush the blockage, while simultaneously spraying backwards to clean the pipe walls as the hose advances.
The result isn’t just a cleared blockage. A properly done jet blast scours the inside of the pipe – removing built-up grease, scale, silt, and organic matter from the walls, not just punching a hole through the middle of the obstruction. That’s what makes it different from a drain snake or a plunger, which shift the blockage without cleaning the pipe.
What It Clears
Jet blasting handles most of the common causes of blocked drains in residential and commercial properties.
Grease and fat buildup is one of the most frequent culprits in kitchen drains – especially in commercial kitchens where large volumes of cooking grease go down the same pipes daily. Over time it coats the pipe walls and narrows the internal diameter until flow drops off. High-pressure water cuts through it cleanly.
Tree roots are a bit different. Jet blasting is effective at flushing out fine root growth and soft root mass, though established root intrusions – thick roots that have taken hold inside the pipe – may need robotic cutting first to remove the bulk before jetting can finish the job.
Silt, debris, and general buildup in stormwater and sewer lines also clears well with jetting, particularly in older pipes that haven’t been maintained in years.
Why Chemical Drain Cleaners Fall Short
It’s worth understanding what those supermarket products do – and what they don’t.
Most chemical drain cleaners work by generating heat through a chemical reaction, or by using caustic agents (sodium hydroxide is common) to dissolve organic matter. On a soft, fresh blockage – hair in a shower drain, for instance – they can work reasonably well.
The problems start when the blockage is anything more substantial.
Chemical cleaners don’t reach fat and grease that’s coated the pipe walls further down the line. They don’t touch tree roots. They don’t clear silt or solid debris. And if the drain is fully blocked, the chemical just sits on top of the obstruction without penetrating it.
There’s also the pipe to think about. Caustic drain cleaners are hard on older pipes, particularly PVC and older clay or concrete systems that may already have some deterioration. Repeated use accelerates that deterioration. And whatever doesn’t work its way through the blockage eventually ends up in the water system.
For a minor, fresh blockage they’re a reasonable first attempt. For anything recurring, persistent, or involving a full blockage, they’re not the answer.
When Jet Blasting Is the Right Call
A few situations where we’d go straight to jet blasting:
Recurring blockages in the same drain. If you’re clearing the same pipe every few months, there’s a reason it keeps blocking. Jetting clears the pipe properly and often reveals what’s causing the issue – which might point to a structural problem worth investigating with a camera.
Slow drains that won’t improve. Partial blockages from grease or scale buildup respond well to jetting. Chemical cleaners typically make no difference on these.
Commercial kitchens and food businesses. Grease trap issues and kitchen drain blockages are best handled with high-pressure jetting on a regular maintenance schedule, rather than reactive callouts when things back up.
Before a pipe reline. Jetting is often the first step before a camera inspection and relining job – it clears loose material, so the camera gets a clear picture, and the pipe surface is ready for preparation.
What Jet Blasting Can’t Do
It’s worth being straight about the limits.
Heavy tree root intrusions – thick roots that have grown well into the pipe – need mechanical removal first. Robotic cutting deals with that; jetting finishes the job.
If a pipe has cracked, collapsed, or badly misaligned joins, jetting will clear the immediate blockage but won’t fix the underlying structural issue. That’s when relining or, in more serious cases, replacement comes into the conversation.
A CCTV camera inspection before or after jetting tells you which situation you’re dealing with. It’s the difference between clearing a blocked drain and understanding what’s going on inside your pipes.
The Bottom Line
Jet blasting works. It clears blockages thoroughly, cleans the pipe walls in the process, and doesn’t introduce chemicals into your drainage system. For most blocked drain situations in Newcastle and Lake Macquarie homes and businesses, it’s our first tool of choice.
If you’ve got a drain that’s blocked, slow, or keeps coming back, give us a call on (02) 4911 9402. We’ll sort out what’s causing it and fix it properly.
Green Planet Plumbing provides jet blasting, CCTV drain inspections, pipe relining, and robotic cutting across Newcastle, Lake Macquarie, and the Hunter.