Drain Draining Slowly? Here's What's Actually Blocking It
Last updated:
Quick answer
In a bathroom it is almost always hair caught just below the grate — reachable with a cheap drain auger, no chemicals needed. In a kitchen it is usually cooled grease coating the pipe further down, which an auger won't shift and an enzyme treatment will, slowly. Reach for caustic drain openers last, not first.
What you might be seeing
- Water pools around your feet in the shower
- The sink takes minutes to empty
- Gurgling sounds after the water drains
- A smell coming back up the drain
Common causes
1.Hair and soap scum (bathroom)
Hair catches on the grate or the first bend and soap residue binds it into a mat. It sits within the first 20cm of the drain in most cases, which is why you can usually reach it.
2.Cooled grease (kitchen)
Oil poured down the sink is liquid when hot and solid when cool. It coats the inside of the pipe further along and narrows it over months. Nothing you can reach with a tool.
3.Food debris on top of grease
Once a grease layer exists, rice, coffee grounds and food scraps stick to it and build up faster.
4.Blocked or dried-out trap
The U-bend under a sink holds water to block sewer smells. If it's packed with debris you get both slow draining and odour.
5.A problem further down the line
If several drains in the house slow down at once, the blockage is past your fittings and in the shared line. That's a call, not a DIY job.
What you can check yourself
Is it one drain or several?
One slow drain is a local blockage you can handle. Several at once — especially if the lowest one backs up first — points at the main line and needs a plumber.
Look down the drain with a torch
In a bathroom you can usually see the hair mat directly. If you can see it, you can hook it out and skip buying anything.
Check the trap under the sink
Put a bucket underneath and unscrew the U-bend. It's the single most likely spot for a kitchen sink blockage and needs no special tools.
Try hot water first on a kitchen drain
Very hot (not boiling, if you have PVC pipes) water flushed through can soften a light grease layer. Free, and it tells you whether grease is the issue.
What you may need
- A hand drain auger for hair blockages
- An enzyme drain maintainer for grease build-up
- A bucket and gloves for opening the trap
Recommended products
Grouped by what you get for the money, not by a ranking.
Budget
The cheapest option that actually solves it
Enzyme Drain Maintainer
Drain treatment
For kitchen grease, where an auger can't reach. Slow by design — use it for upkeep, not on a sink that's already full.
Best for: Kitchen drains that keep slowing down
See the full breakdownShopee
We don't track a price for this yet
Lazada
We don't track a price for this yet
Best Value
The balance most people should pick
Hand Drain Auger
Drain tool
For a bathroom drain blocked with hair this physically removes the blockage, works every time you need it again, and involves no chemicals.
Best for: Bathroom drains blocked with hair
See the full breakdownShopee
We don't track a price for this yet
Lazada
We don't track a price for this yet
Some links here are affiliate links. If you buy through them we may earn a commission at no extra cost to you. How this works.
Common questions
Is baking soda and vinegar worth trying?
It fizzes impressively and does very little to an actual blockage. It's fine as light maintenance on a drain that still works, but it won't clear a mat of hair or a grease layer.
Why shouldn't I just use a chemical drain opener?
They work on some organic blockages, but they're harsh on older pipes and seals, dangerous to handle, and if they don't clear it you now have a pipe full of caustic liquid that anyone working on it has to deal with.
How do I stop it happening again?
A hair catcher in the shower drain and not pouring cooking oil down the kitchen sink prevents most repeat blockages. Wipe oily pans with kitchen paper before washing them.