01

How to recognise it

A joint with an internal step can catch paper and debris, leak into the surrounding ground or admit roots. Clearance may restore flow without removing the defect.

  • Blockage recurs at the same distance
  • Camera footage shows a step or gap
  • Roots or soil enter at a joint
02

Removal and prevention

Clean and survey the line, then select a patch, liner or excavation according to the displacement and access.

Repair the joint and retain footage or measurements for future reference.

  • Match the tool to the pipe and material
  • Verify full flow after clearance
  • Investigate a fast recurrence
  • Change disposal or maintenance habits where relevant
03

Step-by-step approach

  1. 1

    Locate the affected section

  2. 2

    Compare the signs with other possible causes

  3. 3

    Choose a compatible removal method

  4. 4

    Restore and verify normal flow

  5. 5

    Prevent recurrence or arrange a condition survey

Important safety point

A symptom cannot confirm the pipe condition on its own. Stop DIY work if the route is unknown, tools jam, wastewater backs up or the blockage returns.