TL;DR
Drain jetting is safe for pipework that's structurally sound and run at a pressure matched to what the pipe can actually take. The catch is that pitch-fibre — widely used for drainage and repair work from the 1950s to the 1970s — and old salt-glazed clay, the material originally fitted under many of Aldershot's Victorian and Edwardian terraces, can't always take standard pressure, so a look inside first is what separates a clean fix from a new problem. A CCTV drain survey tells us which one you've got before anything gets switched on. If you're not sure what's running under your Aldershot property, get in touch and we'll check before we jet anything.
When jetting gets considered in the first place
Most calls start the same way: a sink that empties slower than it used to, a toilet that gurgles after it flushes, or a smell that wasn't there last month. In Aldershot's older streets — North Town, Cargate, the roads around Manor Park — these symptoms often trace back to drainage laid when the houses went up, decades before plastic pipe was standard. Grease, root fingers and general silt build-up narrow the bore over time, and drain jetting is usually the first thing that comes to mind because it's fast and it doesn't involve digging up a garden.
That instinct is right more often than not. Most blockages are debris sitting inside a pipe that's otherwise in good condition, and jetting clears that kind of problem quickly. The question worth asking before booking anything is what the pipe itself is made of and what state it's actually in — because the answer changes the plan.
Why pitch-fibre and old clay need checking first
Pitch-fibre pipe was fitted extensively from the 1950s through the 1970s — a bitumen-impregnated fibre conduit that was cheap and quick to lay, which is exactly why so much of it went into the ground during that period of house-building. It ages unevenly: sections can go oval under soil pressure, and once that's happened the pipe wall is no longer a uniform, predictable shape. Salt-glazed clay, which is what a lot of Aldershot's Victorian and Edwardian terraces were originally fitted with, has its own weak points — joints that have moved slightly over a century, and surfaces that erode with prolonged exposure to what's been flowing through them.
Neither material behaves like the PVC or HDPE pipe used today. A jet that's perfectly fine for a modern pipe can, on a section of deformed pitch-fibre or a displaced clay joint, open up a crack that wasn't a problem yesterday. That's not an argument against jetting old pipework — it's an argument for knowing what you're dealing with before the water goes on.
What a CCTV survey actually tells us
Before we jet anything we're not confident about, we run a camera through it. The footage shows us the internal diameter along the run (so we can see if a pitch-fibre section has gone oval), whether there are cracks, fractures or missing sections, how far any tree roots have got in, and how much grease or silt has built up on the walls. That picture tells us whether the pipe is sound enough for standard jetting, needs a lower pressure and a gentler nozzle, or shouldn't be jetted at all until it's repaired.
It's the same logic as checking a roof before you pressure-wash it — you want to know what's underneath before you commit to a method that assumes it's solid. Our CCTV drain surveys exist specifically to answer that question, and for anyone in Aldershot's older housing stock, it's a worthwhile check that avoids a much bigger conversation later.
Jetting vs relining: the actual decision
Once we know what we're working with, the choice tends to make itself:
- Sound pipe, debris blockage — standard domestic jetting clears it, restores the original bore, and there's no digging involved. This covers the majority of calls we get from Aldershot's terraced streets.
- Borderline pipe — some deformation or wear, but no active failure — a lower-pressure jet with a forward-facing nozzle, run in short bursts with camera checks in between, clears debris without adding stress to weak points.
- Genuinely damaged pipe — cracks, joint separation, significant root ingress — jetting isn't the answer here, because it risks turning a contained problem into an active leak. Pipe relining inserts a new resin-cured liner inside the existing pipe, effectively giving a fragile pitch-fibre or clay drain a fresh internal surface without excavating the garden or driveway above it.
The survey findings decide which of these three you're in, not guesswork or how the pipe looks from the access point.
What we do differently on fragile pipework
When a survey shows a pipe that's borderline but still workable, the approach changes from a standard jet. Pressure gets set lower and monitored throughout rather than left at a default setting. The nozzle choice shifts to one that directs water forward along the pipe rather than hard against the walls. We work from the downstream access point so the jet travels with the flow instead of pushing against it, and we run the water in shorter bursts with the camera back in between passes, rather than one long continuous blast. Once the blockage is cleared, a second camera pass confirms the pipe's condition hasn't changed — that nothing's been opened up that wasn't there before.
This is standard practice on the kind of housing stock you get across Aldershot and the surrounding towns — Farnborough, Fleet, Camberley, Ash, Ash Vale, Farnham — where mature, tree-lined roads mean root ingress is a genuine and recurring factor in older drainage, on top of the age of the pipe itself.
