Limescale at Home: Removing It and Slowing It Down
What limescale is, why it builds up in hard water areas of the UK, how to remove it from taps, kettles and showers, and what water softeners can and cannot do.
Limescale is the chalky white or grey crust that collects on taps, kettles, shower heads and inside heating systems. It is calcium carbonate left behind when hard water evaporates or is heated. It is harmless to health, but it wastes energy, clogs fittings and makes bathrooms look tired. Much of the south and east of England has hard water, while much of Scotland, Wales and the north-west has soft water.
Do you live in a hard water area?
Your water supplier's website usually lets you check by postcode. Signs include:
- White crust on taps and shower screens
- A film on the surface of tea
- Soap that does not lather well
- Kettles that fill with scale quickly
Where it causes trouble
| Place | Problem |
|---|---|
| Kettle | Scale on the element wastes energy and flakes into drinks |
| Shower head | Blocked nozzles and a weak spray |
| Taps and aerators | Poor flow and crusty rims |
| Washing machine and dishwasher | Scale on heating elements shortens life |
| Boiler heat exchanger | Reduced efficiency in hard water areas |
| Glass and tiles | Cloudy marks and rough texture |
Removing limescale safely
Most household limescale responds to mild acid.
Kettle
- Fill half with water and half with white vinegar, or use a citric acid solution.
- Bring to the boil and leave for an hour.
- Pour away, rinse thoroughly and boil fresh water twice before using.
Shower head and taps
- Fill a bag with white vinegar and secure it around the head with a rubber band, or remove the head and soak it.
- Leave for 30 to 60 minutes.
- Brush the nozzles gently with an old toothbrush, rinse and refit.
Glass and tiles
Spray diluted vinegar or a bathroom descaler and leave for a few minutes. Wipe with a cloth. A squeegee after showers prevents build-up.
Washing machine and dishwasher
Run an empty cycle with a descaling product designed for the appliance, or follow the manual.
What to avoid
- Vinegar on natural stone such as marble and limestone, or on some grout, which it can etch.
- Mixing cleaning products. Never mix vinegar with bleach or other chemicals.
- Abrasive scourers on chrome and glass, which scratch and make it hold more scale.
- Strong acid on rubber seals for long periods.
If you are unsure, test a small hidden area first.
Preventing limescale
- Wipe taps and screens dry after use.
- Run a hot cycle on the washing machine regularly.
- Use dishwasher salt, if your machine has a softener.
- Descale the kettle every month or so.
- Consider a filter jug for drinking water, which reduces scale in the kettle.
Do you need a water softener?
Salt-based water softeners swap calcium for sodium, protecting pipes and appliances throughout the house. They cost typically from several hundred to a couple of thousand pounds including installation, and need salt top-ups and a drain connection. Scale inhibitors and magnetic devices make claims that are less well supported, so be sceptical and ask for independent evidence.
Whether a softener is worth it depends on how hard your water is, how much you rely on appliances and heating, and how long you will stay in the home. In rented homes, it is the landlord's decision.
Boilers and heating
Scale in a combi boiler can reduce hot water flow and efficiency. Regular servicing helps spot this. See our boiler service guide. Do not attempt to descale gas appliances yourself.
If you need a plumber to fit a softener or to replace a heavily scaled tap or valve, you can search on Compito, compare ID-verified providers by postcode and send a request.
A worked example: an electric kettle and a shower head
A household in a hard water area notices the kettle takes longer to boil and the shower sprays sideways. The owner descales the kettle with a vinegar or citric acid solution, rinses and boils fresh water twice, then soaks the shower head in a bag of vinegar for an hour and brushes the nozzles. Both are noticeably better. If this needs doing every month, a filter jug and a quick wipe after showers will stretch the time between descales.
How often to descale
| Item | Typical routine |
|---|---|
| Kettle | Every month or two in hard water areas |
| Shower head | Every two to three months, or when the spray changes |
| Taps and aerators | Quarterly, or when flow drops |
| Washing machine | A hot or descaling cycle every few months |
| Dishwasher | Salt and rinse aid topped up, plus an occasional cleaning cycle |
Signs of scale you cannot see
Noisy, slow heating, a boiler that cuts out or a hot water supply that has become weak can point to scale build-up in the system. Do not open or descale gas appliances yourself. Ask a Gas Safe registered engineer to inspect and advise during a service.
Soft water areas
If you live in a soft water area, limescale is usually less of a problem, but you may still see some deposits where water evaporates. Clean as above, and avoid heavy chemicals that are not needed.
Rented homes
Tenants can descale kettles, taps and shower heads. If scale has damaged a boiler, tap or appliance supplied by the landlord, report it in writing. Do not change plumbing or fit a softener without permission.
Frequently asked questions
Is limescale harmful to drink?
Hard water minerals are generally considered harmless. Flakes in a drink are unpleasant but not usually dangerous. If you are concerned, consult your water supplier or doctor.
Does vinegar damage taps?
Short contact with diluted vinegar is fine for most chrome taps, but long soaks can damage some finishes and rubber. Rinse well.
Does descaling save energy?
A clean heating element transfers heat better, so you may save a small amount. The main benefits are longer appliance life and better performance.