Blocked or low-pressure shower head
A weak or patchy shower spray is one of the most frustrating plumbing niggles in any home, and you're far from alone if you're experiencing it. Hard water deposits and limescale naturally accumulate inside shower head nozzles over time, gradually restricting water flow and creating uneven spray patterns. This is especially common in areas with harder water supplies across the UK, and it affects even the best-maintained homes. The good news is that this is almost always a straightforward DIY fix that takes just a few hours and costs next to nothing — most of the time, a simple soak in white vinegar does the trick beautifully. This guide walks you through diagnosis and cleaning, plus what to do if the damage is beyond recovery. If you're uncomfortable removing the shower head, or if the problem persists after cleaning, that's when it's worth calling a qualified plumber to rule out pressure issues elsewhere in your system.
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Most likely cause & what to check
Limescale build-up in the shower head nozzles is the most common cause of uneven or weak spray.
Remove the shower head by unscrewing it from the hose (turn anti-clockwise).
Soak the shower head in a bowl of white vinegar overnight, or use a proprietary descaler for 30–60 minutes.
Use an old toothbrush to scrub the nozzles — they should poke out freely when clean.
Rinse thoroughly and refit. Run the shower briefly before using to flush any residue.
If the shower head is heavily corroded or the nozzles are permanently blocked, replacement heads are inexpensive.
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Frequently asked questions
Why does my shower head get blocked when my kitchen tap runs fine?
Shower heads have much smaller nozzles than taps, so they block more easily as limescale builds up. The water also sits in the head between uses, allowing deposits to harden. Kitchen taps have larger openings and flow faster, which naturally resists scale accumulation.
Is white vinegar safe to use on all shower head materials?
Yes, white vinegar is safe for plastic, chrome, stainless steel, and most metals. If your shower head has delicate finishes or is antique, do a quick patch test first. Most modern shower heads are designed to handle descaling products without damage.
How often should I clean my shower head to prevent this happening again?
In hard water areas, a quarterly vinegar soak (or every 3–4 months) keeps limescale at bay. In softer water regions, once or twice a year is usually enough. Regular cleaning prevents the stubborn blockages that take much longer to shift.
What if the pressure is low throughout the whole house, not just the shower?
If multiple outlets have weak flow, the problem is likely your mains supply or an internal blockage rather than the shower head itself. In that case, contact your water supplier or a qualified plumber to investigate the wider system.