Why Your Drains Keep Blocking

A single blocked drain is usually a minor inconvenience. A drain that keeps blocking every few weeks is a sign something further down the line needs proper attention.

Tree root intrusion

Tree roots are drawn to the moisture and nutrients inside sewer pipes and can work their way into even small cracks or joints. Once roots are inside a pipe, they trap debris and create a partial blockage that gets worse over time. This is especially common in Sydney's older, leafier suburbs with established street trees and mature gardens.

Ageing or damaged pipes

Older clay and cast-iron pipes can crack, corrode or shift over decades, creating rough surfaces and misaligned joints where debris collects. A pipe that's structurally compromised will keep causing blockages no matter how often it's cleared, until the damaged section is repaired or relined.

Grease and fat build-up

Fat, oil and grease poured down kitchen sinks solidify as they cool, gradually narrowing the inside of the pipe. This builds up over months, so blockages can seem to appear suddenly even though the cause has been accumulating for a while.

Incorrect items flushed or rinsed away

Wet wipes, sanitary products, and excess toilet paper are common causes of toilet blockages, since most don't break down the way toilet paper does. In the kitchen, food scraps and coffee grounds down the sink can build up in the same way as grease.

When to get a CCTV drain inspection

If a drain has blocked more than once in a short period, a CCTV camera inspection is usually the most reliable way to see exactly what's going on inside the pipe, rather than guessing. It lets a plumber identify root intrusion, cracks or collapsed sections and recommend the right fix, whether that's a spot repair, relining, or full pipe replacement.