Instant
01 · Ask
Softener, filter or full treatment?
Hard water marks, smells, private supply — describe the issue and the AI tells you what kind of system you need.
Remove limescale.
Whole-system descale or scale-inhibitor fitted — for hard-water areas with kettling boilers and clogged showers.
✓ Updated May 2026✓ Free quotes✓ Vetted pros
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Hire a water treatment specialist. Tested before treated.
Read the brief on testing, WRAS approval and maintenance — then let Three local specialists quote.
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02 · Read the brief
Walk in informed
Water test reports, WRAS-approved kit, bypass valves, salt consumption, UV bulb life. Know what to ask.
60 seconds
03 · Compare
Compare 3 specialist quotes
Three local specialists quote on the same diagnosis — system, install, maintenance — so the soft water lasts.
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Top tips
Hiring a water treatment, without the regret.
Four moves that separate a smooth job from a nightmare.
Test before you treat.
Hard water, iron, chlorine, bacteria — each needs different treatment. Insist on a water test before the installer recommends a system.
Check WRAS approval.
Any equipment touching drinking water must be WRAS approved. Cheaper kit often isn't — and Building Control will flag it.
Specify the bypass.
Softener installations should have a bypass for raw water (gardening, drinking water). Without a bypass, you're softening every drop unnecessarily.
Maintenance is the cost.
Filter cartridges, salt, UV bulbs — annual running cost can match the install. Get the maintenance schedule and cost in writing before signing.
Costs & timeline
Know what it costs. Know when it ends.
Indicative UK ranges and what affects price.
Cost range
By job type
Inc. VAT · 2026
Source: NMT quotes
Source: NMT quotes
Water softener (install)
£600–£2k
Whole-house carbon filter
£400–£1.2k
Reverse osmosis (under-sink)
£300–£900
UV sterilisation systemPrivate supply
£500–£1.5k
Iron / manganese filtration
£1.5k–£4k
Annual maintenance
£100–£400
!
Quote spread is typically ± 18% — always get 3 quotes.
At a glance
Infographic · VideoThe Water Treatment briefing.
Infographic
Water Treatment quick-view
Video guide
Water Treatment explained
Limescale removal — descaling boilers, taps, kettles in hard water areas. Expect to pay £100–£600 for UK limescale removal service.
What Does the Work Involve?
Specialist arrives with chemical descaler. Boiler power flush. Tap and shower descaling. Kettle and dishwasher descaling. Hardware-specific. Prevention advice.
Typical Costs
| Item | Low (£) | High (£) | Notes |
|---|---|---|---|
| Boiler power flush | 300 | 800 | Combi system |
| Boiler chemical descale | 200 | 500 | Combi/system |
| Tap and shower descale | 50 | 200 | Per outlet |
| Kettle/dishwasher descale | 20 | 80 | DIY-friendly |
| Whole-house descale | 500 | 1,500 | All appliances |
| Annual maintenance contract | 150 | 400 | Boiler + appliances |
| Limescale inhibitor install | 100 | 400 | Inline polyphosphate |
UK Regulations
Gas Safe for gas boiler work. WaterSafe for water fittings. WRAS-approved chemicals.
Frequently Asked Questions
Power flush worth it?
Yes for inefficient hot water/radiators. £300-£800 restores 10-20% efficiency.
Prevention or treatment?
Water softener (£500-£2,500) prevents. Annual descale (£200-£500) treats.
Inhibitor install?
Polyphosphate dispenser £100-£400. Reduces limescale formation. Mid-tier solution.
How often descale?
Annual minimum hard water area. Quarterly kettle.
DIY descaling effective?
Vinegar/citric acid for kettles, taps. Boiler: professional only.
Best UK descaler brands?
Calgon (washing machine), HG, Limescale Gold. Professional chemicals stronger.
This guide was written with AI assistance and is intended for general information only. Prices are estimates based on UK averages and may vary by region. Always get at least three quotes and consult a qualified professional before starting any work.
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