A blocked pipe usually has more going on than the single obstruction a set of rods can reach.
Years of grease lining the pipe wall, a bed of hardened silt, or root growth spread across the full width of the drain sit there untouched once rodding’s cleared the immediate blockage.
Where the water still isn’t running away properly after that, high-pressure jetting is usually the next step, and in plenty of cases it’s the method that should have been used from the start.
Glasgow Drainage Pros runs high-pressure jetting across Glasgow and North Lanarkshire, on its own as a cleaning job and as part of a wider unblocking visit. Call 0141 673 3535 and tell us what’s already been tried. We’ll tell you honestly whether jetting is what the drain needs or whether something else is going on.
What high-pressure jetting actually is
A jetting hose goes into the drain from the nearest access point, usually a manhole or an inspection chamber, with a nozzle fitted to the end that rotates as the water passes through it. Some people call it water jetting, others hydro jetting. It’s the same equipment either way: a pump behind the hose forces water through the nozzle at pressures that typically run to a few thousand PSI, and it’s the pressure doing the work rather than any chemical or blade.
As the nozzle travels forward through the pipe it cuts through grease sitting on the pipe wall, breaks up scale and compacted silt, and shears through root ingress that’s worked its way in through a joint. Whatever gets cut loose is carried back along the pipe by the flow of water and flushed out at the access point, rather than sitting further down the run waiting to cause the next blockage.
The real difference between jetting and a set of rods is what happens to the rest of the pipe. Rods push through whatever’s directly in front of them and stop there. Jetting scours the whole circumference of the pipe as it moves, so a drain that’s been jetted properly comes out clean rather than just clear enough to run again for a few weeks. On a straightforward first-time blockage, our engineers can usually clear it with rods alone and there’s no need to bring the jetting van out. Where the pipe’s been building up for years, or where a drain keeps blocking despite being cleared each time, jetting reaches the cause that rodding leaves behind.
The nozzles we use, and what each one’s for
Choosing the wrong nozzle wastes a visit, so the engineer picks the head to match what’s actually in the pipe rather than reaching for the same one every time. The rotating nozzle does most of the work on a standard call-out. It spins as the water passes through it, spraying in every direction and covering the full width of the pipe in a single pass, which makes it the right choice for general grease removal and the day-to-day jobs where we haven’t already seen what’s ahead of the camera.
A penetrating nozzle, sometimes called a flushing nozzle, is built differently. Its rear jets are narrower and angled to drive the head forward through the pipe rather than clean as it goes, so it’s the one used first to punch a way through a dense blockage before switching to a nozzle that finishes the job properly. A root-cutting nozzle carries a small cutting head that saws through root growth as it turns, which matters where a root mass has filled a joint, because rodding or a standard rotating nozzle would only punch a hole through the middle of it and leave the rest to grow back within months.
Where scale has set hard against older clay or cast iron pipework, a descaling nozzle (some engineers call it a chisel nozzle) fires jets forward and back to break the deposit up before a standard clean runs through the rest of the length. Root-cutting nozzles do the same job an electromechanical cutter does on a general unblocking visit, just built into the jetting head instead of run as a separate tool.
Standalone clean or part of an unblocking job
Booked as its own visit
Plenty of jetting jobs aren’t tied to a blockage at all. A property with older pipework, trees nearby, or a history of recurring problems benefits from having the drain jetted on a preventive, planned basis, before anything actually blocks. Domestic drains generally hold up fine with an annual clean where there’s a reason to keep an eye on them, tighter for busier households or older clay pipework. This kind of visit sits under our wider drain maintenance work, and it’s worth booking if a drain has blocked more than once in the past year even after clearance.
Rolled into a clearance visit
Most of the time, though, jetting turns up as part of an unblocking job rather than as a booking on its own. The engineer arrives to clear a blocked drain, finds rods aren’t shifting it or that the blockage keeps returning along the same stretch, and brings the jetting equipment out from the van there and then. No second visit needed, and the pipe ends up just as clean as if the jetting had been planned from the start.
To find out which of these fits your drain, call 0141 673 3535 and describe what’s happening. We’ll ask a few questions and tell you what we think before anyone comes out.
Jetting for commercial kitchens and grease traps
Grease behaves differently in a commercial kitchen than it does in a house. Fat, oil, and grease from cooking (FOG, in the industry shorthand) goes down the sink warm and liquid, then cools and sets hard against the pipe wall further along the run, and a grease trap only catches what makes it that far before the drain beyond it starts narrowing anyway. Restaurants, takeaways, cafes, and pub kitchens across Glasgow deal with this build-up constantly. Left unchecked, the drain slows first and then backs up into the kitchen, usually during service when it causes the most disruption.
A single jetting visit on a fresh blockage does clear it, but kitchens with real turnover are better served by a scheduled clean, typically every few months rather than waiting for the next backup. We size the nozzle to the pipe and the grease trap itself, because a trap’s internal baffles can be damaged by the wrong pressure or the wrong angle, and we clean the trap alongside the run rather than treating them as separate jobs. Environmental health inspections look at grease trap condition too, so a kitchen with a jetting schedule already in place has less to explain if an inspector asks.
Jetting ahead of a CCTV drain survey
A pipe coated in grease or sitting under a layer of silt hides the kind of defect a CCTV drain survey is meant to find, because the camera can’t see through the build-up to the pipe wall underneath. Where a survey’s been booked on a drain that hasn’t been cleaned recently, we jet it first so the camera gets a clear run rather than a blurred pass through debris.
Jetting ahead of a survey clears the pipe for the camera, and it sometimes resolves a minor issue on its own before the camera even goes in, though it doesn’t replace an actual repair if the survey turns up a defect underneath.
The two jobs are usually done on the same visit. Jetting first, then the survey straight after, means one call-out covers both rather than two separate bookings, and the report that comes out the other end is based on what the pipe actually looks like once it’s clean.
When jetting isn’t the first move
Jetting is powerful enough that it isn’t always the right first step. Older Glasgow pipework, the kind found under West End tenements and other Victorian-era streets, is often clay, and clay that’s cracked, softened, or sitting on loose joints can come apart under pressure that a modern plastic pipe would shrug off. Cast iron behaves similarly once it’s corroded thin. Putting a jet through a length of pipe that’s already failing risks turning a blockage into a collapse.
Where there’s any doubt about a pipe’s condition, particularly on a drain that’s already shown signs of damage or sits in a known trouble spot, we’ll check it with a camera or work it with rods first rather than reach straight for the jetter. If that shows the pipe’s sound, jetting goes ahead as planned.
If it shows cracking, displacement, or a section close to collapse, that’s a drain repair conversation before any cleaning happens, because jetting a failing pipe doesn’t fix anything. It just moves the damage further along the run.
Where we do high-pressure jetting across Glasgow
The pipework under Glasgow varies a lot by area, and that shapes how a jetting job gets approached. Tenement streets across the West End, the inner Southside around Shawlands and Pollokshields, and older parts of the East End and Maryhill still run largely on clay drains that are decades old, which is exactly the pipework covered above: sound enough for jetting most of the time, but checked first where there’s any reason for doubt.
City-centre commercial premises and newer estates on the edges of the city tend to have more modern plastic pipework that handles jetting without the same caution. North Lanarkshire, including Coatbridge and Airdrie, gets the same approach applied, whichever side of the boundary the property sits on.
Book a high-pressure jetting visit
Call 0141 673 3535 and tell us what’s going on: whether rods have already been tried, whether it’s a one-off blockage or something that keeps coming back, and whether it’s domestic or a commercial kitchen. We’ll ask a few questions on the phone, tell you honestly whether jetting sounds like the right job, and get an engineer out with the right nozzle already in mind rather than working it out on the doorstep.
For a blockage that hasn’t been looked at yet, the drain unblocking page covers how a standard clearance visit runs. If a drain keeps blocking and you’d rather understand what’s happening before booking anything, send us a message and we’ll get back to you with next steps.
