To unblock a drain, remove the visible debris, pour 4 litres of hot (not boiling) water down the drain, then work a plunger over the opening for 30 seconds. If water still backs up, a drain snake fed 3 to 4 metres into the pipe clears most remaining blockages. When none of that works, the blockage is deeper in the line and needs a licensed plumber.
Key takeaways
- A plunger, hot water, and a hand-fed drain snake clear roughly 8 in 10 household blockages.
- Skip caustic chemical drain cleaners. They damage older Adelaide pipework and rarely shift a solid blockage.
- Repeat blockages, sewage smell, or more than one fixture backing up at once means the problem is in the main line.
- A basic blocked drain in Adelaide runs 220 to 480 dollars, so a 30-minute DIY attempt is worth making first.
Work out where the blockage actually is
Before you reach for any tool, find out how far the problem spreads. If one sink drains slowly, the blockage sits in that fixture's trap or branch pipe and is usually an easy fix. If several fixtures back up together, or the toilet gurgles when you run the kitchen tap, the blockage is in a shared drain or the main sewer line, and that is licensed plumbing work.
Lift the gully trap grate outside, normally near an external wall, and check whether it is holding water. An overflowing gully is a strong sign the blockage is downstream of the house and needs a plumber rather than a plunger.
The DIY steps that actually clear a drain
Work through these in order. Each one is low risk and costs almost nothing, and most blockages give way before you reach the snake.
- Clear the visible debris. For a sink or shower, pull out hair and gunk from the strainer and the top of the trap by hand or with bent wire.
- Flush with hot water. Pour about 4 litres of hot tap water steadily down the drain to soften grease and soap. Use hot, not boiling, water because boiling water can crack ceramic and loosen old pipe joints.
- Plunge with a seal. Cover the overflow hole with a wet cloth, fill the basin with enough water to cover the plunger cup, and push and pull firmly for 30 seconds.
- Clean the P-trap. Put a bucket underneath, unscrew the trap under the sink, clear it out, and refit it. This catches a large share of kitchen and bathroom blockages.
- Use a hand drain snake. Feed it 3 to 4 metres into the pipe, turning the handle so it grips the blockage, then draw it back out.
Why caustic drain cleaners are a poor choice in Adelaide
Supermarket drain cleaners feel like the quick option, but they are a bad fit for a lot of Adelaide homes. Plenty of properties built before the 1980s still run earthenware or early PVC drainage, and repeated doses of caustic cleaner degrade those joints and the pipe wall over time.
Caustic cleaners also struggle with the blockages people most often face: a solid mass of hair, a wad of wet wipes, or tree root intrusion. The chemical sits on top of the blockage instead of clearing it, and you are then snaking or plunging through a pipe full of caustic liquid. A plunger and a snake are safer and usually more effective.
When to call a licensed plumber
Stop the DIY attempts and call a licensed Adelaide plumber if any of the following is true. These point to a blockage in the main line or a damaged pipe, and clearing them needs a drain machine, a hydro jetter, or a CCTV camera.
- The same drain blocks again within a few weeks of you clearing it.
- More than one fixture backs up at the same time, or the toilet bubbles when another fixture drains.
- You can smell sewage inside the house or around the external gully.
- Waste water is surfacing in the garden, the lawn, or at the gully trap.
- The house was built before 1985 and you suspect tree roots, since mature gardens and clay drains are a common Adelaide combination.
What a plumber does that a snake cannot
A licensed plumber starts with a CCTV drain camera to see the exact blockage and its distance down the line. That step alone tells you whether you are dealing with grease, roots, or a collapsed section, which decides the right repair.
For roots and stubborn build-up, hydro jetting cuts the blockage out with high-pressure water and scours the pipe wall clean. If the camera shows cracked or collapsed pipe, pipe relining repairs the line from inside without digging up the yard. Drainage work on the property side of the inspection point is licensed plumbing work under the Plumbers, Gas Fitters and Electricians Act 1995, so it is not a job to attempt yourself.