Why Do My Drains Keep Blocking — Even After Being Unblocked?

Why Do Drains Keep Blocking?

If you’ve had your drains unblocked recently but the problem has come back, you’re not alone. Homeowners in Bournemouth, Christchurch, and Poole often face recurring drain blockages — but why does it happen?

Common Causes of Repeat Blockages

1. Tree Root Ingress – roots force their way into cracked pipes (common in Canford Cliffs, Branksome, and Highcliffe).

2. Collapsed or Damaged Pipes – especially in older clay pipes found in Bournemouth’s Victorian houses.

3. Scale and Grease Build-up – fat, oil, and soap scum can re-collect quickly after cleaning.

4. Foreign Objects – wipes, nappies, or other items flushed down toilets.

Why Standard Unblocking Doesn’t Always Work

Basic jetting or rods only clear surface-level obstructions. If there’s a structural issue (like cracks or root intrusion), the blockage will return.

The Long-Term Fix

• CCTV Drain Survey: to diagnose the hidden cause.

• Drain Re-lining: seals cracks without excavation.

• Excavation and Replacement: for collapsed or severely damaged pipes.

• Regular Maintenance: jetting and inspections every 12–24 months.

Local Insight

We see repeat blockages most often in:

• Southbourne & Littledown — sandy soils shift, causing pipe movement.

• Poole & Parkstone — tree roots are frequent culprits.

• Christchurch & Mudeford — coastal water tables put extra pressure on pipes.

📞 If your drains keep blocking, call 01202 028 818. Our Bournemouth drain specialists will find and fix the root cause.