How to unclog a drain without chemicals
Clean the pop-up stopper first — in a bathroom sink it is the cause about half the time — then plunge, then open the P-trap under the sink. Skip the caustic drain cleaner entirely: it rarely clears a real blockage, it damages older pipes, and it makes the job hazardous for whoever eventually opens that line.
- Difficulty
- Easy
- Time
- 30–60 minutes
- Parts cost
- $0–$30
- Trade
- Plumbing
What you need
- Bucket
- Channel-lock pliers
- Cup plunger
- Drain snake or a plastic zip tool
- Gloves
Step by step
- 01
Pull and clean the stopper
On a bathroom sink, lift out the pop-up — you may need to loosen the pivot rod behind the drain. What comes up is usually hair and toothpaste, and usually that is the whole problem.
- 02
Plunge it properly
Block the overflow hole with a wet rag first, or you are just pushing air around. Enough water in the basin to cover the plunger cup. Short sharp strokes, keeping the seal, for about twenty seconds.
- 03
Open the P-trap
Bucket underneath, loosen the two slip nuts by hand or with pliers, drop the trap out. This is where the blockage is more often than not. Clean it and check the wall arm behind it while you are there.
- 04
Snake the branch line
If the trap was clear, the blockage is further along. A small hand snake will reach a few feet. Feed it gently and turn as you go rather than forcing it — you are trying to break through, not to punch a hole.
- 05
Flush it through
Reassemble, run hot water for a couple of minutes and watch the joints you disturbed. Slip nuts should be hand-tight plus a nudge; over-tightening cracks the plastic.
Stop and call somebody if…
- More than one fixture is slow or backing up at the same time — that is the main line, not a branch
- Water comes up in the tub or shower when the toilet flushes
- There is sewage smell or waste water backing up anywhere
- You have snaked it and it clears for a day, then returns — that usually means roots or a break
One slow sink is a Saturday job. Two or more fixtures backing up at once is a main line, and that is worth a camera before anybody digs anything.
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