When a drain is blocked or damaged, it's tempting to assume the fix is obvious. In practice there are two very different repair approaches, and they solve different problems. Matching the wrong one to your drain can mean paying for a repair that doesn't actually fix anything.

Quick Answer

Hydro jetting clears blockages caused by roots, grease and debris, but it doesn't repair the underlying pipe damage that let them in. Excavation and replacement fixes that damage by digging up and replacing the failed section. A CCTV inspection is what tells you which one your drain actually needs, rather than guessing from the symptom alone.

What Hydro Jetting Does

Hydro jetting uses high-pressure water to clear blockages caused by root intrusion, grease, and general debris build-up. It's effective and fast, and it restores flow through the pipe. What it doesn't do is fix the underlying damage, such as a cracked joint or an offset section, that let the roots or debris in to begin with. Jetting is best used as a maintenance measure, or as a way to clear a line enough for a clean CCTV inspection to follow.

What Excavation and Replacement Does

Excavation and replacement is the more thorough option. The damaged section of pipe is dug up and replaced entirely, usually with HDPE pipe rated for well over 100 years of service. This is the right approach when a pipe has collapsed, has multiple defects along its length, or can't be cleared and accessed well enough to be confident jetting alone will hold. Where several sections of an older clay or concrete drain are failing at once, replacing the run is often more cost-effective than repeated call-outs to clear the same blockage.

How the Right Method Gets Chosen

The decision comes down to what the drain actually needs, not a guess based on symptoms alone. A CCTV inspection confirms the exact cause and location of the problem before any repair method is recommended. If the pipe is structurally sound and the issue is a build-up of roots or debris, jetting combined with a maintenance plan may be all that's needed. If the camera shows a collapsed section, a crack, or a joint that has failed, excavation is the only repair that actually addresses it.

  • Structurally sound pipe, recurring blockage: jetting with a maintenance plan
  • Collapsed section, crack, or failed joint: excavation and replacement
  • Multiple failing sections along an older clay or concrete drain: replacing the run

The Cost of Getting It Wrong

Jetting a pipe that has already failed structurally clears the immediate blockage, but the same problem returns, often within months, because the cause was never fixed. On the other side, excavating a pipe that only needed clearing is a significant, unnecessary cost and disruption. This is why every repair at Drainage Works starts with a camera inspection and a written report, so the method is chosen based on evidence rather than assumption. See our drain repair guide for more on how each repair option compares.

Common Questions

Can jetting fix a cracked pipe?
No. Jetting clears the blockage but does not repair the crack or joint that let roots or debris in. It buys time, not a permanent fix, and the same issue is likely to return.
How do I know which repair I need?
A CCTV inspection determines this, not the symptom on its own. A recurring blockage in a structurally sound pipe is often a jetting and monitoring situation. A collapsed or heavily damaged section needs excavation and replacement.

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