What the service should include
A contractor should understand the site's operation, isolate affected areas, control customers or staff and choose equipment for the pipe and contamination risk.
- Confirm the affected system and access
- Assess hazards and previous treatments
- Explain the proposed method
- Check the result before leaving
Questions, evidence and outcome
Service records should identify work completed, recovered material, remaining defects and practical prevention or maintenance actions.
- Are risk assessment and access controls included?
- Can waste handling and reporting requirements be met?
- What planned maintenance is justified by evidence?
Step-by-step approach
- 1
Describe every symptom
- 2
Disclose products and previous work
- 3
Agree scope and price basis
- 4
Ask how the result will be verified
- 5
Keep footage, reports and repair recommendations
Important safety point
Tell the engineer about every chemical or home treatment already used. Hidden corrosive liquid can put people at risk when a pipe or trap is opened.