The water starts draining slowly. At first you notice it pooling around your feet, then it sits there stubbornly long after you’ve stepped out, and eventually there’s a faint smell. If that sounds familiar, you almost certainly have a shower drain blocked with hair — and hair is the number one culprit. Not limescale, not old pipes: hair, matted together with soap and body grease, building up into a soft plug you can’t even see.
The good news is that in most cases you can sort it yourself in ten minutes without calling anyone. Here’s how: first we’ll unblock it, then we’ll cover what really matters — making sure it doesn’t happen again.
Why Your Shower Drain Gets Blocked with Hair
Every shower means lost hair. It’s perfectly normal: according to the Spanish Academy of Dermatology, a person sheds between 50 and 100 hairs a day, and a good chunk of those wash down the drain when you shampoo. Down there they snag on the grate, in the trap, on any little ridge inside the pipe.
Hair on its own wouldn’t cause much trouble. The problem is that soap, shower gel and body grease stick to that tangle and compact it into a solid mass. Every shower adds another layer, until one day the water simply can’t get through. If you live in Valencia, the hard water (and it really is hard here) calcifies that plug further and makes it even tougher to shift — you’ll see the same limescale that frosts your shower screen and taps doing the same damage inside your drain.
How to Unblock a Shower Drain: Step by Step
Before you buy anything, try the old-fashioned approach. It works more often than you’d think.
1. Remove the grate. Most lift off by hand or with a flat-head screwdriver. Underneath you’ll see the start of the blockage: that grey, slimy mass that is essentially hair glued together with soap.
2. Pull out as much as you can by hand. Use rubber gloves, a bent wire coat hanger, or one of those cheap plastic drain-cleaning strips (the barbed ones you can pick up for a couple of euros). Pull slowly so you don’t break the tangle and leave half of it behind. Done properly, this alone clears about 70% of blockages.
3. Bicarbonate of soda and white vinegar. Pour half a cup of bicarbonate of soda down the drain, follow it with a cup of white vinegar, leave it for ten minutes, then flush with a good stream of very hot water (not boiling if you have PVC pipes). This breaks down the grease and soap that’s holding the plug together.
4. A plunger. If the drain is still sluggish, a standard rubber plunger over the plughole — with a little water sitting in the shower tray to create a seal — usually shifts whatever’s left.
What we’d steer you away from is reaching straight for a bottle of chemical drain cleaner. From experience: those caustic soda products are harsh, they degrade pipe joints and PVC with repeated use, and against a hair blockage they often don’t even work that well. Keep them as a last resort, not a first instinct.
Quick Reference: Which Method to Use
| Symptom | Recommended approach | Time |
|---|---|---|
| Water draining slowly | Remove hair by hand + hot water flush | 5 min |
| Puddle that takes ages to drain | Bicarbonate of soda & vinegar + plunger | 15 min |
| Completely blocked, no flow | Manual drain snake / auger | 20 min |
| Blocks again every few weeks | Check the full trap (or call a plumber) | — |
| Bad smell as well as blockage | Clean the trap + investigate root cause | — |
The Part That Actually Matters: Stopping It Coming Back
Clearing the drain is easy enough. Having to do it every month is the annoying part. Prevention costs almost nothing:
- Put a hair catcher over the drain. They cost two or three euros at any hardware shop and catch 90% of the hair before it even enters the pipe. Empty it every couple of showers and you’re done. Honestly, nothing else comes close for effort-to-result ratio.
- Pick hair out of the tray before it washes away. If a clump comes loose while you’re washing your hair, grab it before the water sweeps it down the drain. Sounds obvious, but this is where 80% of the problem starts.
- Hot water flush once a week. A good run of hot water shifts the soap grease before it builds up and starts trapping hair.
- Bicarbonate of soda and vinegar once a month. As routine maintenance, not emergency rescue. Keeps the trap clean and heads off any smell before it starts.
If you want to understand why drains start to smell in the first place, we cover that in our guide to bathroom odours — blockages and bad smells tend to go hand in hand.
When It’s Not Hair — It’s Something Else
If you’ve tried everything above and the water still drains badly, or the blockage keeps coming back within a fortnight no matter what you do, you’re no longer dealing with a surface hair plug. Watch out for these signs:
- Several drains block at once — basin, shower, toilet. That points to the main stack, not your shower tray.
- Gurgling sounds when you empty the bath, or water backing up somewhere else. A sign the problem is further down the system.
- An older flat where the plumbing has never been touched.
In those cases the issue is in the pipework, not the grate. That’s governed by Spain’s Building Technical Code (Código Técnico de la Edificación — the CTE, Spain’s equivalent of UK Building Regulations), which sets out required gradients, stack ventilation and minimum pipe diameters in its health and sanitation document. We see this regularly in flats in El Cabanyal and the Eixample in Valencia — buildings where the drainage hasn’t been touched in decades, and what starts as a repeated blockage ends up revealing a much bigger problem. Our bathroom plumbing guide walks you through when it’s time for a proper inspection.
The damp that comes with a poorly draining shower also leaves its mark: if you notice the tray taking ages to dry out or dark stains appearing, take a look at our guide to bathroom damp and its causes.
Frequently Asked Questions
Why does the same shower drain always block?
Because that’s where hair from washing your head collects — and it’s the longest, most tangle-prone hair you’ve got. A hair catcher on that drain cuts the problem at source. If it still blocks even with a filter in place, check the trap itself: some designs retain too much water and hair by their very shape.
Are chemical drain cleaners bad for pipes?
Over time, yes. Caustic soda dries out seals, damages PVC with repeated use, and often doesn’t even dissolve a hair blockage effectively. Better to remove the hair by hand and use bicarbonate of soda with vinegar. Keep the chemicals for genuine emergencies, not monthly maintenance.
How often should I clean my shower drain?
Empty the hair catcher every two or three showers, and do a hot water and bicarbonate flush once a month. Stick to that and you’re unlikely to have a serious blockage again. Five minutes a month beats a Sunday afternoon wrestling with a drain snake.
Does Valencia’s hard water make blockages worse?
Yes. Limescale deposits on the inside of pipes and narrows the usable diameter, so hair and soap snag more easily. The limescale doesn’t cause blockages on its own, but it accelerates them. You’ll notice the same effect on your shower screen, taps and fixtures — it’s all the same water.
When is it worth replacing the shower tray or drain altogether?
When the blockage keeps returning despite proper cleaning, when the trap is visibly deteriorating, or when you’re already thinking about a bathroom renovation. A full refurbishment is the right moment to fit a modern linear drain — they evacuate water far more efficiently. Get an idea of costs with our bathroom renovation calculator.
The Bottom Line: Get the Hair Out, Keep It Out
A shower drain blocked with hair is one of the easiest bathroom problems to fix and one of the easiest to prevent. Hair is behind 90% of blockages, and a two-euro hair catcher plus the habit of picking up any loose hair before it washes away will nearly eliminate the problem. Skip the bottle of chemical drain cleaner: hot water, bicarbonate of soda and a bit of consistency do more and treat your pipes far better.
And if the blockage keeps coming back no matter how well you clean, it’s not the grate — the installation needs looking at. If your bathroom has reached that point and you’re thinking about a full renovation, tell us what’s going on or see how we approach bathroom renovations in Valencia. We’ll tell you straight whether it’s a five-minute fix or a proper job.
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