TL;DR: If your waste disposal is not draining in Christchurch, it is usually caused by a blockage in the disposal unit, the trap, or the drain line. The issue is often related to a buildup of food waste or debris.

What “not draining” usually means.

If water is sitting in the sink or draining very slowly when using the waste disposal, it usually indicates a restriction somewhere in the system.

This restriction prevents water from flowing away as it should.

The most common causes

Buildup inside the disposal unit

Food waste, grease, or debris can collect inside the unit over time.

This can reduce how effectively it breaks down waste and allow material to build up.

Blocked trap under the sink

The trap is the curved section of pipe beneath the sink.

It can collect debris and become partially or fully blocked, restricting flow.

Blockage further down the drain

If the pipe beyond the disposal is blocked, water will not be able to drain away properly.

This can cause water to back up into the sink.

Grease and food residue

Grease can solidify inside pipes and combine with food particles.

This creates a buildup that slows or blocks drainage.

Why the disposal may still run

In many cases, the disposal unit will still operate even if the drain is blocked.

This can make it seem like the unit is working when the problem is actually in the pipework.

What you can try

There are a few basic steps you can take:

• Run water while operating the disposal to help flush debris
• Check for obvious blockages near the sink outlet
• Avoid putting additional waste into the system until the issue is resolved

If the blockage persists, further investigation may be needed.