Drain Descaling Explained

Why scale forms

Hard water deposits and long-term use create a rough surface inside pipes. Over time, this buildup catches debris and significantly narrows flow, making blockages more likely.

• Hard water minerals (limescale) accumulate over decades
• Older clay and cast iron pipes are most affected
• Rough deposits snag grease, wipes, and debris
• Reduced bore size means slower flow and frequent clogs

How descaling works

• Rotating chains/cutters: break and scrape deposits from pipe walls
• High-pressure water: flushes fragments and debris out
• CCTV survey: confirms clearance and checks for damage
• Gradual approach: multiple passes may be needed for heavy deposits

When to consider descaling

• Recurring blockages despite jetting
• Older clay or cast iron drainage systems
• Property purchase surveys showing thick deposits
• Slow flow across multiple fixtures
• Before lining to improve bond quality

Benefits & considerations

• Restores capacity: clears years of buildup
• Reduces blockages: smoother bore catches less debris
• Pre-lining prep: clean pipes accept liners better
• Fragile pipes: may not suit badly cracked systems

A CCTV survey first confirms whether descaling is safe and worthwhile for your pipes.