Drainage Knowledge Hub

Find guidance by problem and setting: household blockages, odour, commercial maintenance, pipe inspection and rain-related backflow.

Recurring problems, inspection and repair

Use the fault history and pipe condition to distinguish cleaning, desilting and repair needs.

Pipe Cleaning Renovation & Install

Showing 1–12 of 16 articles · Page 1 of 2

2026-09-25

High-Pressure Drain Jetting: When It Helps, How It Works and Risks

Jetting can remove grease and sediment from pipe walls and long runs, but access, pipe condition and the blockage type must be assessed first.

2026-09-25

Seven Reasons Drains Keep Blocking After Clearance

Repeated blockage can involve grease, hair, objects, renovation waste, poor falls, damaged pipes or shared drains. Investigate the cause before repeating the same treatment.

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2026-09-25

Several Drains Blocked at Once: Private Branch or Shared Building Drain?

Multiple slow or backing-up outlets can indicate a downstream restriction. Stop water use, record the affected area and coordinate the correct inspection.

2026-09-25

When Is CCTV Drain Inspection Needed? Uses, Limits and Reports

CCTV helps investigate recurring blockages, concealed pipes and suspected defects. Learn when it is useful, what it cannot show and what a report should contain.

2026-09-25

Cracked Drain Pipes: Warning Signs, Checks and Repair Planning

Recurring odour, damp walls, ceiling stains and repeat blockages can warrant a pipe investigation. Learn what evidence to record and when CCTV helps.

2026-09-25

Drainage Problems in Older Hong Kong Buildings: Odour, Backflow and Leaks

Use the affected area and timing to distinguish private outlets, shared stacks, chambers and public drainage.

2026-09-25

Desilting or Drain Unblocking? Choosing the Right Work

Distinguish opening a blockage from removing accumulated sediment, and understand when pipe cleaning or CCTV may also be needed.

2026-09-25

When Should a Toilet Be Replaced? Repair, Reinstallation or Drain Clearance

Distinguish damaged ceramic and installation faults from downstream blockages before deciding whether a new toilet is needed.

2026-09-25

New-Flat Drainage Problems: Handover Checks for Slow Flow, Odour and Leaks

Record each outlet before renovation and occupation to distinguish handover defects, altered connections and shared drainage problems.

2026-09-25

Drain Odours in Mong Kok Older Buildings: Water Seals, Shared Drains and Anti-Siphonage

Trace recurring smells in older Mong Kok flats by checking water seals, pipe condition, pressure changes and shared drainage.

2026-09-25

Drain Smells in New Tseung Kwan O Flats: Water Seals, Debris and Connections

Investigate drain odours after handover or renovation in Tseung Kwan O, preserve evidence and distinguish internal fittings from shared systems.

2026-09-25

Slow Drains and Odours in Sha Tin Estates: Outlet Checks and Shared-Pipe Problems

A practical guide for Sha Tin, Tai Wai and Ma On Shan residents to distinguish hair, dry seals, dirty traps and shared drainage faults.