Here is what to do.
Start With the Kettle
Boil some water and let it cool for a minute. Pour it down the pipe slowly. Kitchen drains that are blocked from built-up grease and food residue respond to this better than most people expect. The reason to cool it slightly is that alot of Australian homes have PVC drainage pipes, and while hot water is completely fine for them, a full sustained boil poured in repeatedly is not ideal for the material over time.
Standards Australia sets the technical benchmarks for plumbing and drainage across the country under AS/NZS 3500. PVC is designed to cope with hot water regularly. A full sustained boil repeatedly is a different story.
Baking Soda and Vinegar for Slow Drains
If the water is moving but just slowly, bicarb and vinegar is worth a shot. Half a cup of each, bicarb first then vinegar straight after. Cover the drain and leave it for thirty minutes. It breaks down soap scum and light grease coating the inside of the pipe. Flush with hot water when the time is up. Just do not bother if the basin is full of standing water going nowhere. It will sit on top and do nothing. This one is for slow drains, not blocked ones.
The Plunger, Used Properly
For a sink, put enough water in to cover the rubber cup before you do anything else. Then block the overflow hole with a wet cloth, because all the pressure you build up will just escape through there if you do not.
Now plunge with real pull strokes and push strokes. The pull is the bit that actually dislodges a blockage. Do several proper cycles before you call it. If you are dealing with a toilet rather than a sink, the flat cup plunger you probably have is the wrong shape for the job. A bellows plunger with an extended rubber flange is what seals properly inside the bowl.
Same drain blocking over and over? Ezy-Plumb can inspect it and fix the actual problem rather than just clearing it temporarily.
Check the P-Trap First
Nobody ever checks that curved pipe under the basin until the sink overflows. By then, it’s usually choked shut with hair, rancid grease, and soap. To clear it, shove a bucket underneath the cupboard, undo both joints by hand, and take the pipe out to give it a proper rinse.
Check the rubber washers before you put it back together. It takes about five minutes and fixes more blocked drains than any product you will find at Bunnings.
A Word on Chemical Drain Cleaners
People reach for these early and that is not always the right call. NSW Fair Trading’s plumbing guidance reflects the professional view that caustic products damage older cast iron pipes over time and should be avoided in those systems.
The more important point, though, is safety. If a drain is completely blocked and you pour chemical cleaner in, it pools in the pipe with nowhere to go. If you then plunge, you push caustic chemicals back up toward yourself. This is how people get burns. Chemical products are fine for drains that are sluggish but still moving. They are not for fully blocked drains, full stop.
When to Stop and Call a Plumber
There are two clear signs that your DIY attempts are over. First, you have seriously tried the basic fixes and nothing has moved. Second, and more importantly, more than one drain in the house is blocked or running slow at the same time. When multiple fixtures fail together, you are dealing with a main sewer line blockage. At that point, a plunger or a bit of vinegar won’t do a thing.
The Institute of Plumbing Australia is clear on this: recurring blockages and main line issues need a licensed plumber. Getting someone there before it backs up further is always the cheaper and less stressful path.
DIY not working? Ezy-Plumb responds fast and has the equipment to clear what household tools cannot. Give Ezy-Plumb a call.
FAQs
Q: What should I try first for a blocked drain?
Ans: Near-boiling water poured slowly in stages. It costs nothing and clears a lot of kitchen sink blockages caused by grease on its own.
Q: When does baking soda and vinegar actually help?
Ans: When the drain is slow but still moving. Not when it is fully blocked with still water sitting in the basin. It is a buildup fix, not a blockage fix.
Q: My plunger does not seem to do anything. Why?
Ans: Check three things: is there water in the basin covering the cup, is the overflow hole blocked with a cloth, and are you pulling as well as pushing. All three matter.
Q: Is it dangerous to use a chemical drain cleaner and then plunge?
Ans: Yes, if the drain is fully blocked. The chemical sits in the pipe and plunging forces it back up. Chemical burns are a real risk. Chemicals are for slow drains only.
Q: What does it mean if more than one drain is blocked?
Ans: Almost certainly a main line blockage. That is beyond what DIY tools can reach and needs a licensed plumber with professional equipment.
