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How to unblock a sink drain

Drain cleaner being used to flush an unblocked drain

Overview

Many things can block a sink. Food scraps, hair or even tree roots can get into the drains. We show you how to unblock a sink and flush it with a cleaner to get rid of any residue.

Tools and materials

Tools

Materials

Steps

1Pump the plunger over the drain hole

Place the plunger over the drain hole and pump the plunger. The suction cup has to be below the level of the water that's standing in the blocked sink.  When it is unblocked the water will drain away nicely and you'll have a free flow of water.
A plunger being used to unblock a drain

2Flush the sink with drain cleaner

Use drain cleaner to make sure nothing else is left in the pipes. Put your gloves on and mix up the drain cleaner, following the instructions on the packet. Tip the drain cleaner down the drain and leave it to sit for the appropriate amount of time. Flush it through with clean water.
Drain cleaner being used to flush an unblocked drain
Health & Safety

Asbestos, lead-based paints and copper chromium arsenic (CCA) treated timber are health hazards you need to look out for when renovating older homes. These substances can easily be disturbed when renovating and exposure to them can cause a range of life-threatening diseases and conditions including cancer. For information on the dangers of asbestos, lead-based paint and CCA treated timber and tips for dealing with these materials contact your local council's Environmental Health Officer or visit our Health & Safety page.

When following our advice in our D.I.Y. videos, make sure you use all equipment, including PPE, safely by following the manufacturer’s instructions. Check that the equipment is suitable for the task and that PPE fits properly. If you are unsure, hire an expert to do the job or talk to a Bunnings Team Member.