Shower head blocked with limescale — how to clean it
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Most likely cause & what to check
Limescale builds up in shower heads in hard water areas — roughly the Midlands, South East, and East of England. You will notice jets spraying sideways or at odd angles, or a significant drop in overall flow.
The easiest method: fill a plastic bag with undiluted white vinegar (or a proprietary descaler solution). Submerge the shower head in the bag and secure it with an elastic band around the arm. Leave overnight — or at least 4 hours for moderate scale.
If the head is removable (unscrew anti-clockwise at the swivel joint), remove it and soak it directly in a bowl of white vinegar. This allows better coverage of internal channels.
After soaking, use an old toothbrush to scrub the face plate and individual nozzles. Many modern shower heads have rubber nozzles — simply flex these with your fingers to break off softened scale.
Rinse thoroughly and reattach. Run the shower for 30 seconds to flush any loosened scale from the internal channels before stepping in.
In very hard water areas, consider fitting a inline shower filter (£15–£40) which reduces scale build-up on the head and also softens the water for hair and skin. Repeat cleaning every 2–3 months.
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Frequently asked questions
How often should I clean a shower head for limescale?
In hard water areas (London, South East, East Anglia, Midlands), clean every 1–2 months. In soft water areas (Scotland, Wales, North West England), annual cleaning is usually sufficient. The first sign of limescale is jets spraying at odd angles rather than straight down.
Can I use cola to descale a shower head?
Cola contains phosphoric acid which can dissolve limescale, and some people use it as a DIY descaler. However, white vinegar (acetic acid) is more effective, cheaper, and does not leave sticky residue. Proprietary descaler products like Viakal or Kilrock are also effective for stubborn deposits.
Will an inline water filter prevent limescale on the shower head?
A shower filter reduces the mineral content of the water and slows limescale build-up significantly. They cost £15–£40 and are easy to install on any shower arm — just unscrew and fit. The filter cartridge needs replacing every 3–6 months. In very hard water areas, a whole-house water softener is more cost-effective long-term.