One problem, one fix
Your drain smells.
Here's exactly why, and how to fix it.
Four faults cause almost every floor-drain problem — smell, slow water, standing water, gurgling. This site walks you through each one with a cutaway, a hook and a kettle. No chemicals, no sales pitch.
4 layers
From the forums
What people actually say
Four lines that come up again and again on plumbing and cleaning forums. Each one maps to a step in our guides.
If it smells but drains fine, it's almost always the drain seal — the rubber flap or the water seal is gone.
Pour a kettle of boiling water down the drain once a week. It melts soap scum and grease.
Hair is the #1 cause of slow shower drains. Pull the stopper and look — you'll see it.
A $5 silicone drain cover stops hair before it gets into the trap. Cheapest fix you'll ever make.
Start here
Which of the four is it?
Pick the symptom that matches. Each type has its own cause, its own test and its own tool.
The shape of every fix
Four moves, in this order
Every guide on the site is a variation of this sequence. Skipping a move is how a small job becomes a call-out.
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1STEP 1
Identify the type
Smell, slow, standing or gurgling. The symptom picks the tool.
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2STEP 2
Lift the cover
Straight up, no tools. Look at what is underneath before touching it.
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3STEP 3
Clean or replace
Hook the hair out, or swap the seal. Ten minutes, hand tools only.
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4STEP 4
Test and prevent
Full jug, clean swirl. Then a cover and a weekly kettle.
Interactive
Pull a floor drain apart.
Drag to rotate. Press Explode and the four layers separate in order — cover, filter, seal, trap. Click any layer to find out what it does and how to remove it.
- 01 Cover plate — lifts straight up
- 02 Hair filter — twists out
- 03 Odor seal — pulls out of the bore
- 04 P-trap — water seal you cannot remove
Community answers
Three questions, answered by people who had it too
Paraphrased from public forum threads, with the source named. Every card links to the guide that goes with it.
My shower drain smells like sewer but drains fine. What's wrong?
If it drains fine, the clog isn't the issue — the seal is. Most modern drains have a rubber flap or a water seal that dries out. Pour a cup of water down it. If the smell goes away, it's a dry trap. If it comes back in a day, replace the seal or install a silicone one-way valve.
My shower drains slowly and there's hair everywhere. How do I clear it without chemicals?
Pull the stopper and look inside. 90% of the time it's a hair ball wrapped around the stopper or just below it. Use a cheap plastic drain snake (or a bent wire hanger) to hook it out. Then pour boiling water down to melt soap scum. Don't use chemical drain cleaner first — it makes the hair a jelly that's harder to remove.
How do I stop hair from clogging my drain in the first place?
A $5 silicone drain cover catches hair before it enters the pipe. Empty it after every shower. Once a week, pour a kettle of boiling water down the drain to melt soap scum. That's it. No chemicals, no plumber.
Quick reference
Drain triage table
Six symptoms, the cause they usually point to, and the one check that confirms it. Print this and keep it under the sink.
| Symptom | Likely cause | Quick check | Fix | Source |
|---|---|---|---|---|
| Smells, drains fine | Dry water seal or perished rubber flap | Pour a cup of water in — does the smell stop? | Top up the seal; replace the flap or fit a one-way valve | r/Plumbing |
| Draining slowly | Hair and soap scum in the first 100 mm | Lift the cover — is hair wrapped round the basket? | Hook it out, then pour boiling water to melt the scum | r/CleaningTips |
| Standing water | Blockage past the trap, in the branch | Plunge once — does the level move? | Spring auger through the trap; call a plumber if it returns | r/Plumbing |
| Gurgling | Blocked vent or siphoned seal | Flush a toilet — do bubbles rise in the drain? | Clear the vent; fit a one-way valve against siphonage | r/Plumbing |
| Clogs again in days | No strainer, so hair keeps entering | Is there a basket or cover over the bore? | Fit a silicone cover; weekly boiling water | r/Frugal |
| Chemical cleaner did nothing | The blockage is solid hair, not grease | Did the liquid just run past it? | Switch to physical removal; do not layer chemicals | r/CleaningTips |
Questions people ask before they start
Why does my drain smell but drain fine?
If the drain flows normally but smells, the clog isn't the issue — the seal is. Most modern drains have a rubber flap or a water seal that dries out. Pour a cup of water down the drain. If the smell goes away, it was a dry trap. If it returns within a day, replace the seal or install a silicone one-way valve.
How do I clear a hair clog without chemicals?
Pull the stopper and look inside. Most hair clogs are wrapped around the stopper or just below it. Use a cheap plastic drain snake or a bent wire hanger to hook the hair out. Then pour boiling water down the drain to melt soap scum. Avoid chemical drain cleaners first — they turn hair into a jelly that's harder to remove.
Why does my drain gurgle when the toilet flushes?
Gurgling usually means the vent pipe is blocked or the water seal is being siphoned out. When the toilet flushes, it pulls air through the drain, and if the vent is blocked, the water seal in the floor drain gets sucked away. Check the roof vent for blockages, and install a one-way drain valve to prevent siphonage.
How do I stop hair from clogging my drain?
Install a $5 silicone drain cover to catch hair before it enters the pipe. Empty it after every shower. Once a week, pour a kettle of boiling water down the drain to melt soap scum. That's it — no chemicals, no plumber.
When should I call a plumber for a clogged drain?
Call a plumber if: water backs up in multiple drains at once, the clog returns within days, you smell sewage throughout the house, or you've tried a snake and boiling water without success. Multiple slow drains usually mean the main line is blocked, which requires professional equipment.
What you need
Three tools, three parts
This is the whole shopping list for every fix on this site. Nothing here costs more than a takeaway.
Plastic drain snake
Hooks hair out of the first 500 mm of pipe. The barbed version grips better than the plain zip strip.
Cup plunger
Moves a soft blockage by pressure. Needs a proper seal over the drain, not a flange plunger made for toilets.
Bucket and old towel
Catches what comes back out and keeps the floor dry. A towel under the bucket stops the slip hazard.
Silicone drain cover
Catches hair before it enters the pipe. The single cheapest thing that prevents the whole problem.
One-way drain valve
A silicone duckbill that opens for water and closes against air. Stops sewer smell and siphonage.
Replacement seal
Restores a perished rubber flap or water cup. Match the brand on the old one if you can.
Guides
Step-by-step, with pictures
Each guide is a sequence of cutaways with a hotspot on the part that matters and one sentence on what to do with it.
Smell but No Clog: How to Fix a Dry or Broken Drain Seal
The drain runs perfectly and still stinks. That narrows it to one part, and you can test it with a cup of water in under a minute.
How to Clear a Hair Clog Without Chemicals (Step by Step)
Hair does not dissolve. Chemicals turn it into a jelly that is harder to hook out, which is why the physical route wins every time.
Standing Water: When to Snake, When to Call a Plumber
Water that will not move at all is a blockage past the trap. There are three tests that tell you whether you can reach it yourself.
Next step
See the four layers move.
The teardown simulator pulls a floor drain apart, layer by layer, so you know exactly what you are reaching for before you reach for it.